Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fc385735af00a4…

MALICIOUS

PDF

41.6 KB Created: 2020-08-21 16:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0c871e5a13eceba0dc1683c538460ffd SHA-1: fdf400733ca076a7b83365af9552bf98500adbf5 SHA-256: 81fc385735af00a45cf22e658c725524b6dec6da8f51922a474124dc2b89fb71
194 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'alcoholic fatty liver treatment guidelines' and embeds multiple links. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=alcoholic+fatty+liver+treatment+guidelines'. This redirector likely leads to a phishing page or malware download. The document also exhibits characteristics of an SEO link farm, suggesting an attempt to distribute malicious content widely.

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=alcoholic+fatty+liver+treatment+guidelines In PDF document text
    • http://files.minisodaaussies.com/uploads/1/3/0/9/130969893/7999909.pdfIn PDF document text
    • http://files.a1moments.com.au/uploads/1/3/1/4/131407148/f1cb1e3ca65cf3.pdfIn PDF document text
    • http://files.thewritesourcetwcspublishing.com/uploads/1/3/1/8/131856121/vumegofu.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/1/0429/9869/4049/files/author_s_style.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/9327/8117/files/avadh_university_phd_form_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3219/0876/files/96507090312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/31055871760.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/niwejelogawaketakare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/ritogerisagusuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/muxekopapifedij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0255/9655/files/anemia_megaloblastica_perniciosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/motezowujena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/1661/3014/files/bobcat_610_service_manual_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/bsc_physics_syllabus_sambalpur_university.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/verutisulazas.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_off0000641f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641F 5588 bytes
SHA-256: 5160b3f3b046bde40c7629d4fbe908d15d7ff64bcafbe734801051a44543186b
font_01_sfnt_off00007700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7700 10048 bytes
SHA-256: 4d3f20bd1b9abaed46088be65853a04ca48abd4e619ce453f2ffdf19acacfa96

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