Malicious PDF — malware analysis report

Static analysis result for SHA-256 398733528b4e8553…

MALICIOUS

PDF

41.0 KB Created: 2020-08-11 15:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 249a47a48e03629d89b4a9f7cbc2894b SHA-1: 79b2096f6bc31112e3b7a3513e155b021e53e69e SHA-256: 398733528b4e8553856a61737834dc30ecb8ec9f1e605d3e3865103cac823075
194 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a known malicious URL, likely to deliver a payload or phish for credentials. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed for SEO manipulation to attract victims. No scripts were extracted, but the primary malicious activity is the redirection via the embedded URL.

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.cc/pify?keyword=college+scholarship+interview+questions+and+answers+pdf In PDF document text
    • http://boboti.siddharthabhutantravel.com/uploads/1/3/1/3/131379732/5354373.pdfIn PDF document text
    • http://files.placerconservation.com/uploads/1/3/1/8/131856380/4692501.pdfIn PDF document text
    • http://midowoput.drtaoka.com/uploads/1/3/0/7/130776031/pifukokofez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/15284439180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/62097683707.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/entrepreneurship_development_small_business_enterprises_charantimath_pearson_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/kugoguwaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/icloud_login_finder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/binary_logistic_regression_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7975/3109/files/lulariganoliwuxitutez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62386903812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1757/4299/files/tipugazezezikozejotejotum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/pupufebosuraramiwonexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/ralodej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.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 3

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_off0000616e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616E 5600 bytes
SHA-256: 1ffe280ccb2581ddfd1b940dc9edc6daeabb673e0c4a817172d6026ddf28303a
font_01_sfnt_off00007480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7480 9996 bytes
SHA-256: b1d8c5e15a2ff7ed9a916213020ed375d5be106fa06244f3438209b7ef42466a

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