Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f86c70b1b509b1…

MALICIOUS

PDF

40.6 KB Created: 2020-08-10 06:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 79439b7c87ab906933d1525f69fa300e SHA-1: 09cee47e9dcb06a26b6e947e30b631a6ddf34fdf SHA-256: 31f86c70b1b509b15b61b9cd1ed6121eacf61feb6bd5b81afb692e1717e27c4c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, masquerading as a syllabus, with the primary link pointing to a known malicious redirector. This indicates a phishing or malware distribution attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest this malicious intent. 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.cc/pify?keyword=environment+and+ecology+syllabus+for+upsc+pdf In PDF document text
    • http://mepavogu.iamlovedministry.com/uploads/1/3/0/8/130814297/pefefo.pdfIn PDF document text
    • http://files.greatalaskanshirtco.com/uploads/1/3/0/9/130969408/317685.pdfIn PDF document text
    • http://files.heartlandwestfargo.com/uploads/1/3/1/4/131410167/ragosuvali.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/1/0443/9041/6550/files/application_for_job_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/20511944209.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5098/2821/files/tiwun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9037/8901/files/paxumoxezuxerilegikuvav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/zowovoxorokajisafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/6554091118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/bafupa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/rodupowaxinaxaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/27557228908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4273/3221/files/32970973982.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_off00005fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDB 5732 bytes
SHA-256: 29cfe74dae025eae625d6a0e6a7d58b5955778e72f9827cc3e19413eae53aa45
font_01_sfnt_off00007359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7359 10004 bytes
SHA-256: a7d51dc19d52e8807464adc2cb16b226f474771669422b9eca02b05b371059fc

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