Malicious PDF — malware analysis report

Static analysis result for SHA-256 538fddae390531a5…

MALICIOUS

PDF

44.6 KB Created: 2020-08-11 20:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: caff5c7e03940462d00833b4945ca553 SHA-1: c6af6529cbae9d7eb23c60dd6c00e289f7a44d88 SHA-256: 538fddae390531a57493e6e1be03b15df50ec288f64940027b152f333ba5ba2f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of embedded links, with the primary link pointing to a redirector service at 'ttraff.ru'. This suggests an attempt to obscure the final malicious destination, likely for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links further supports this assessment. 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=definicion+de+gastritis+aguda+pdf In PDF document text
    • http://foluge.livingconscious.net/uploads/1/3/0/9/130969059/43d700a0f772e73.pdfIn PDF document text
    • http://notibu.grinnandberrit.co.uk/uploads/1/3/2/6/132682787/2018964.pdfIn PDF document text
    • http://files.abbykingphotography.com/uploads/1/3/0/8/130874520/kolokad-xajobabofu-lunexisa-nokabugemajaleg.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/1/0433/1805/0984/files/47143913459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/benim_hocam_video_ders_notlar_2020_matematik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8516/6760/files/kafowi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/fujuzirupusegarumiwobigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4755/8037/files/32572570104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/art_of_action.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/nokapukapunafevabeteta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6875/0998/files/tamamulesawemevikijesisum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0278/0072/files/53417593046.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/kisobipujisit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/88890662392.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7192/2591/files/30782096893.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
🗂 Part of campaign: hillsideswimteam.com 3 samples

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_off00006ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CED 5292 bytes
SHA-256: a978675eb684b39c8f4e6199d78b990128332fdc50299d56eea1f95ee5a117b5
font_01_sfnt_off00007eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFF 11332 bytes
SHA-256: 7d2fe43570ab429f862ce79eafe75a9b69548ca6f629a5788e61377b2e4dd0ec

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