Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6abb21a3e8e939…

MALICIOUS

PDF

35.1 KB Created: 2020-07-10 17:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 24138b434d86e9e1b7e561f488d307e8 SHA-1: 163850c0c694edd8eb1f26195329d3f59f62f7c5 SHA-256: af6abb21a3e8e939006588108408e797337b1f52df4aa713c02f539babdece6d
194 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to known malicious redirector infrastructure. The document body text and embedded links suggest a lure related to merging PDF files, which is a common tactic to disguise malicious URLs. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of dangerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=merge%20two%20pdf%20files%20into%20one%20online%20free In PDF document text
    • http://files.msrcampbell.com/uploads/1/3/1/8/131857193/lidumox-vujopobevezuj-dugosolizuxa.pdfIn PDF document text
    • http://files.carolrivers.com/uploads/1/3/0/7/130774990/1132181.pdfIn PDF document text
    • http://files.knockatallonns.com/uploads/1/3/1/4/131406269/cc5b8e911b4c14.pdfIn PDF document text
    • http://files.adelaide-pilates.com/uploads/1/3/0/7/130739761/zijupepojumoviziwese.pdfIn PDF document text
    • http://files.hawaiineiartcontest.org/uploads/1/3/0/9/130969386/fatiw.pdfIn PDF document text
    • http://files.absolutelypaintedfaces.com/uploads/1/3/1/6/131606429/fizuneweponorif.pdfIn PDF document text
    • http://files.ceclayton.com/uploads/1/3/0/7/130739557/26b62a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gigepopigep.files.wordpress.com/2020/06/59177859972.pdfIn PDF document text
    • https://vimasevepu.files.wordpress.com/2020/07/9080942396.pdfIn PDF document text
    • https://wivobajet.files.wordpress.com/2020/06/tomekanatazipodabewotuva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/sazarizexik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7236632937.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_off00004918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4918 4884 bytes
SHA-256: 3fc16b3fbf7c8b1318b8bd464fe47801d39ae2e1e17e31901f56247db3ce19ce
font_01_sfnt_off000059e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59E2 12360 bytes
SHA-256: 37c95a2fc4c6ae31d582dbdbde3c5554c595d369507704ee6d143d36ceb669d2

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