Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf31626c62bd8351…

MALICIOUS

PDF

113.1 KB Created: 2020-09-19 09:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 00ba34d9f164ce1945b71d60fda72bb8 SHA-1: 30fc4c34146d4b6064bf0620132f81edd2b94c43 SHA-256: bf31626c62bd8351fd949a86538ccd3b1e2f3f9db2a8a3bcfb17aca7535c275c
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or redirection strategy. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for academic search results. The combination of these factors suggests a phishing or redirection attack.

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/wix?keyword=bscs+biology+a+molecular+approach+answers In PDF document text
    • http://files.medfieldk8pto.com/uploads/1/3/2/7/132710592/7407f8b.pdfIn PDF document text
    • http://files.vinoandvetmed.com/uploads/1/3/1/4/131407965/liratupuwed.pdfIn PDF document text
    • http://files.makeupbybb.com/uploads/1/3/0/8/130814581/puzejuxuxel.pdfIn PDF document text
    • http://files.graceyourspace.com/uploads/1/3/0/8/130813899/gedoduseraf.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/1/0440/2066/2422/files/guion_de_pastorela_comica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/barca_live_app_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8987/0491/files/12521123507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9970/9855/files/vunegosizedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6423/9014/files/47820180674.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3983/4791/files/rolidopovujapogufejizomar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/zexurebarirometili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/4079/5806/files/present_perfect_tense_exercises_worksheet.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_off0001750c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1750C 5732 bytes
SHA-256: 5591a463b509af2ec7d66b52bb6f62acb048857c1bd015f0df49e2bb1ea6682f
font_01_sfnt_off00018875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18875 15028 bytes
SHA-256: 0dd38244c3a4c14925d7442c0989bfabc50d9fc9218ca2e19b54b0841e1601ca

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