Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b2335de57e0db3…

MALICIOUS

PDF

41.0 KB Created: 2020-08-01 17:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3e7b9524704fd9bd06b991aefa8a3e43 SHA-1: 3bf0d915c0370104598e7415a291f65b19b8f6dc SHA-256: a4b2335de57e0db349bafc4179995d0a7a673235918c543253f025d1d7a18ef1
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded external links, forming a link farm. One critical heuristic firing indicates that these links lead to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=i-+129f+cover+letter, which is likely used for phishing or malware distribution. No scripts were extracted from this sample.

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/pify?keyword=i-+129f+cover+letter In PDF document text
    • http://files.mohitdubey.com/uploads/1/3/1/6/131606636/32c2214.pdfIn PDF document text
    • http://files.wildcatrollerhockey.com/uploads/1/3/2/8/132815343/fedarup-zajamadef.pdfIn PDF document text
    • http://files.undertheirrelevance.com/uploads/1/3/1/4/131438843/dijafesig.pdfIn PDF document text
    • http://files.herbssupply.com/uploads/1/3/0/7/130775200/mekivukopatar-sazufexi-rewarofubup.pdfIn PDF document text
    • http://files.gobrazil.co.uk/uploads/1/3/2/7/132741211/sunupisamojoxer.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/1/0431/9143/5422/files/14918029521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/75290023841.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/robaderakiredexagif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/namagufadekidexin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2782/2749/files/vimovutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/sefokalegexebaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3460/5728/files/xovajogitiwukumorawud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7990/9017/files/pujipakatenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/89182568797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/pufebuleruvejufom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/62240086332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7364/2389/files/letipazisu.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_off00006337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 4856 bytes
SHA-256: e5bbb7c81e39e4faeab287f94b0cd5153440ea500f5eb85586c0e31ac8cd20e8
font_01_sfnt_off000073ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73EA 10488 bytes
SHA-256: 48f57622094978ce52e38e26420d8c5cb5bd3769a6470fdee3e8c01f18e797d5

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