Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3aa2e1b8480a4b…

MALICIOUS

PDF

43.5 KB Created: 2020-08-26 10:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9a007541675ca4d50d5e308dcb44490e SHA-1: 6f6a7157e4eb07feed97f1d6369d15cb792f6b38 SHA-256: 5f3aa2e1b8480a4b4c4e948b536599896cb05858f04c73f64d4992204fc53c3e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to what appears to be an SEO link farm designed to distribute malicious content. The primary redirector URL, https://ttraff.cc/pify?keyword=quadriceps+strengthening+after+knee+surgery, is flagged as malicious. The document body, though heavily obfuscated, contains this same redirector URL, suggesting an attempt to lure users into clicking through to a malicious site under the guise of academic material.

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=quadriceps+strengthening+after+knee+surgery In PDF document text
    • http://suwopotub.trinidadrifleassociation.org/uploads/1/3/1/1/131164250/gozume.pdfIn PDF document text
    • http://files.kinesiologyandcounselling.com/uploads/1/3/1/4/131438002/wudizelapu_gekilu.pdfIn PDF document text
    • http://files.tulsalines.com/uploads/1/3/1/0/131069789/e487a295.pdfIn PDF document text
    • http://files.greenrootsgourmet.com/uploads/1/3/1/4/131453588/26d064099ed1a50.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/1/0438/6163/9318/files/bsc_number_theory_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tawoxusabevesumaxev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0212/6755/files/mupoguwupedutulakajun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7518/9401/files/80256057178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/44588360399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/kisamulugawe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4492/8674/files/ketuzebejiwotetazinemu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4555/1256/files/93941037469.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_off00006a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A81 5612 bytes
SHA-256: 33719fc84cdb85ffa58e2f10993e56519baaf918cc57d2d33e1b938db28e65e5
font_01_sfnt_off00007d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9A 10516 bytes
SHA-256: 6958eedfddfd324935bef84c8a1beb7b3191598acb9705d7b487ea42d2a2ea6a

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