Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5bc31f0a0fb135…

MALICIOUS

PDF

49.3 KB Created: 2020-07-31 12:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 17703b66b668b37890af9655dce91646 SHA-1: cdcfc9431fa6c352bb66616271315f5b15e20c24 SHA-256: 9a5bc31f0a0fb1350479ad7e716c060c816d43d7f3489348515de09d1fc80669
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector (ttraff.cc). The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is not user-facing content but rather to host a large number of external links, likely for SEO manipulation or to distribute further malicious content.

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=carotenoides+antioxidantes+pdf In PDF document text
    • http://files.denglenntraveljunkies.com/uploads/1/3/0/7/130739718/5827093.pdfIn PDF document text
    • http://files.net4bags.com/uploads/1/3/0/9/130969699/doduxete_lijawonelug_bumepup_tilebagogemiv.pdfIn PDF document text
    • http://files.nlreservoir.com/uploads/1/3/1/4/131453022/rufafanabox.pdfIn PDF document text
    • http://files.safepassagemoberly.org/uploads/1/3/0/7/130738701/vukojokur-nuliwabazovuj.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/1/0437/0815/4008/files/puboguroxepuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/jaxaponaxonusu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4498/6280/files/8844681109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7692/7134/files/2954573464.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2204/9695/files/zolesin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0879/4525/files/xipejerafabekifataf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/mapudanini.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/88165962658.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/zubub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/ravibilodubirotibekonag.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 6

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_off00008537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8537 4880 bytes
SHA-256: 8eea62fe0f2ccd765646124063e1a9e0380d0b87fe2fbf03e07a5a49f7c09d2c
font_01_sfnt_off000095dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95DD 9968 bytes
SHA-256: 8eac1ccff4ec6cd7119754cf5eedaea053a3f09c38e5a745a5987bed4f139f79

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