Malicious PDF — malware analysis report

Static analysis result for SHA-256 137873e1bfa992be…

MALICIOUS

PDF

45.5 KB Created: 2020-08-18 13:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 10e25d7da6a0b85286874c4f753ae1be SHA-1: 8f62b0d0fe44cf30d7cdc4eb5035daeeaf4e33ed SHA-256: 137873e1bfa992be362a5a7dccfb5f8fc4d27a25baa5faa0906574dc4157657d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.com) which is associated with malicious activity. The document body, though heavily obfuscated, contains the same URL that is presented as a lure, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=usg+guided+supraclavicular+brachial+plexus+block In PDF document text
    • http://dotuzaga.bethlehem505.org/uploads/1/3/0/7/130739967/9725072.pdfIn PDF document text
    • http://files.bridington.com/uploads/1/3/1/4/131407974/2920628.pdfIn PDF document text
    • http://files.debbybolandwatt.net/uploads/1/3/0/8/130814758/d39288f16a3.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/1/0437/2656/9633/files/sovasus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/vitamina_d_alimentos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0000/3747/files/bopefijajidep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/mofikoluvoxazuvorifajop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7034/7677/files/saxogosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8250/5628/files/37037550314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9083/6645/files/95321569402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/57531279011.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/thai_horror_movies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8328/2070/files/remdio_caseiro_para_cseos_amigdalianos_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0371/5481/files/dusefosutewe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4572/4055/files/31945076451.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_off00006a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A92 5656 bytes
SHA-256: 806c823e1d74969c7e38572601a0ffd39d56f5e31217a1d969702342733d4701
font_01_sfnt_off00007dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD1 13736 bytes
SHA-256: 00442f2325d9fe74fc1ceada456dc3b13adadbc7fdf1733858d7b6b805ed7d91

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