Malicious PDF — malware analysis report

Static analysis result for SHA-256 50aaf4bc8b27f1a5…

MALICIOUS

PDF

41.7 KB Created: 2020-08-06 20:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c35c778dc8f5f7a8d01dec1856a9757a SHA-1: d21b70fc514bb92a8650ea4193d636cef8f06a90 SHA-256: 50aaf4bc8b27f1a5b39eb02a3f8784e11432de4263ebd7f3abced84a8e6da04d
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to academic papers and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly supports the malicious verdict. The primary attack vector appears to be a link farm designed to redirect users to 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.com/pify?keyword=bihar+board+12th+model+paper+2020+science+pdf In PDF document text
    • http://sadumixux.arielmeylanart.com/uploads/1/3/1/0/131070331/abab6d6.pdfIn PDF document text
    • http://files.sunsandandsilk.com/uploads/1/3/1/4/131453706/rinowujanof_rizemawebukeki_texax.pdfIn PDF document text
    • http://files.lquertportfolio.com/uploads/1/3/2/7/132710756/5409682.pdfIn PDF document text
    • http://files.garage-doors-in-sheffield.co.uk/uploads/1/3/1/6/131606636/wuboriluzo-bekuzuwan.pdfIn PDF document text
    • http://files.smarthvacsupply.com/uploads/1/3/1/3/131380001/3866e38c01.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/1/0433/5337/4874/files/11128568294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1493/0084/files/shake_your_tail_feather_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/dedux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/tuveravem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/wafegijiwojilevep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/kosototonozebuguguno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3920/2207/files/blackboard_palm_beach_state.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/62163152865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/mafonozuvufakifujilaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/install_memcached_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/povomuxaduwozexofo.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_off00006402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6402 5912 bytes
SHA-256: 84cf98fc21f9ae47f1bb47858b698266a4e8dbb134c497fb65a48f63566156d7
font_01_sfnt_off000077f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F0 9904 bytes
SHA-256: c5fd2c26d2c56e60a50d15b2f76c6ab349ab0819c80f37b194fd9b7a52451f9b

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