Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afb054e20c3cb09…

MALICIOUS

PDF

50.5 KB Created: 2020-07-15 20:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 8a636487d073ca12ee27a3718f760a57 SHA-1: 1668cef437ae0a02a474a86e69ed3f3b494f6aaa SHA-256: 4afb054e20c3cb09103f0c83340107435e8c35327f60049cc8e352f747fe6eec
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains multiple heuristics indicating malicious intent, including a critical finding of a link to a known malicious redirector. The document body, though heavily obfuscated, suggests lures related to payment or invoice changes, consistent with Business Email Compromise (BEC) tactics. The presence of a large number of external PDF links, while not directly malicious, indicates a link farm likely used for SEO poisoning or traffic redirection. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=unify%20pdf%20online In PDF document text
    • http://files.outdoorcircle.org/uploads/1/3/0/7/130776324/8403165.pdfIn PDF document text
    • http://files.pennjournalconlaw.com/uploads/1/3/2/6/132682694/bawibixijuzawo.pdfIn PDF document text
    • http://files.baragisladottir.com/uploads/1/3/1/3/131378993/c454ab86ed.pdfIn PDF document text
    • http://files.minilivestock.com/uploads/1/3/2/7/132740415/38a223c.pdfIn PDF document text
    • http://files.whereyoumake.com/uploads/1/3/2/7/132741571/zilazud.pdfIn PDF document text
    • http://files.amindfulmosey.com/uploads/1/3/0/8/130874143/be009cf21894586.pdfIn PDF document text
    • http://files.soulfulyogini.com/uploads/1/3/1/3/131378923/gonudalomebulipaze.pdfIn PDF document text
    • http://files.kristenandersen.com/uploads/1/3/0/7/130776674/ba8bde256b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://muwexuwet.files.wordpress.com/2020/06/23309100488.pdfIn PDF document text
    • https://tatusedujej.files.wordpress.com/2020/07/20031571334.pdfIn PDF document text
    • https://kodekexisaxi.files.wordpress.com/2020/06/roxesolilaxajedexoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/rivadudizomelopemede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/64647361000.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/88275509516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/56943618542.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/lubejidafagiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/90964004527.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65788935473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8964 4352 bytes
SHA-256: da166c8eb04000885e770a2e703b600d9739dfd183f903e06dc7d946dcf147b4
font_01_sfnt_off0000983d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x983D 10624 bytes
SHA-256: 9e65de94cc1e3d98a432f7292015c765040e04f95c0e52ae9dc6e7aa0de978a3

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