Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac22cb48b088c3c…

MALICIOUS

PDF

40.4 KB Created: 2020-09-10 12:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d5ee362c32cec19103c7a6b13860ce6c SHA-1: 619eac8f78fb69b760aff667f9529c43f7d11821 SHA-256: bac22cb48b088c3c44a252193ac3739b86c947795a80bbe76e87e03a2e910a61
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host numerous PDF files. One of these links, https://ttraff.link/wix?keyword=retencion+de+placenta+bovinos+pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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.link/wix?keyword=retencion+de+placenta+bovinos+pdf In PDF document text
    • http://files.missmiddlegausa.com/uploads/1/3/1/3/131380305/6755487.pdfIn PDF document text
    • http://xemokaron.entotofoundation.org/uploads/1/3/0/7/130740292/2145317.pdfIn PDF document text
    • http://files.stephaniejanaina.com/uploads/1/3/0/8/130874495/kovizobulobatet.pdfIn PDF document text
    • http://files.gchorns.com/uploads/1/3/1/8/131857916/c2dfa4.pdfIn PDF document text
    • http://files.easternshorechess.com/uploads/1/3/1/3/131382531/guriperoforozige.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/1/0437/9944/5661/files/kopasofafarolov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/pisapofowej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/58621390317.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0981/7251/files/43741035469.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2274a7_97bef03260af4b608d2e3b50f6e9e309.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/40512e_be65b425d112405da59b1cd2ed765868.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6cf804_303a2293207b4dd19aa73eaa3f97dead.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/941881_915cce0e7b774d71bf5e6586036dd688.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5899d5_64c937062e574819ae34265825a401d4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c12414_3d8d7eeaaa174c1eae374b78f10e8178.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_off00006068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 5260 bytes
SHA-256: 6d579e33e37aa576cc2fabdc167bd18df7e428d676a98ab855a97c06d23e3c2f
font_01_sfnt_off00007269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7269 10160 bytes
SHA-256: 026892b9aa2262b8fa4cade948f141ae544e83d1fecd7391ecd2aff7ef13f6a8

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