Malicious PDF — malware analysis report

Static analysis result for SHA-256 164b3aae5dd056d6…

MALICIOUS

PDF

48.3 KB Created: 2020-08-08 21:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 771f82883f8f94657b6399cadfc9f7f9 SHA-1: fd7a7ad3d9e6e1dc7fa47ab451c5c408635a3cda SHA-256: 164b3aae5dd056d6b6c639d6e1a33b5d67b571164bb15803278cfa82877ec61f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a free download, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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=russian+english+dictionary+of+verbal+collocations+pdf In PDF document text
    • http://files.jokerentertain.com/uploads/1/3/0/8/130814784/3342286.pdfIn PDF document text
    • http://files.awhillans.com/uploads/1/3/1/4/131483371/doxivotujizarag-busokugiratevus-gajavomizedubed.pdfIn PDF document text
    • http://files.evavoutsaki.com/uploads/1/3/2/6/132682471/nefaburusijes_tilorad.pdfIn PDF document text
    • http://files.terraobscura.net/uploads/1/3/0/7/130740257/4486629.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/1/0431/0712/3357/files/appraisal_form_216.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/6845/1992/files/animal_tissue_culture.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/28046666212.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/tekubopodubixaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29121996303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/74386013360.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/wogodum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/put_animated_gif_in.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4580/6503/files/gimekoxusivifajon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5349/8014/files/71858052278.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_off00007d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D71 5724 bytes
SHA-256: 9342cd384c36120a32461741060000d49e85876719a12ed53dd63098333f92ee
font_01_sfnt_off000090f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F9 10316 bytes
SHA-256: c9ced234884b964dec5909f70e7ab2384eef5ab877dd091a191a07af5ab22ec7

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