Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a8815b7908a671…

MALICIOUS

PDF

76.1 KB Created: 2020-08-28 07:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 417e80fc3226ed0d791791667a433d60 SHA-1: f3d40b813e723cec5e6101d82b4532b7dc8b0101 SHA-256: 77a8815b7908a671c40dc17aee07fc1b18472052ec022635be3d3caf5d531919
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, disguised as a psychosocial assessment tool. The heuristic firings indicate the PDF is a malicious redirector and part of an SEO link farm, likely intended for phishing or malware distribution. No scripts were extracted, but the primary attack vector is the malicious URL.

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=psychosocial+assessment+tool+pdf In PDF document text
    • http://files.lscodn.org/uploads/1/3/0/8/130874162/df5fd83b7330b63.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/1/0438/1048/8477/files/30054312604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/difinebasigesosekimix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7390/4545/files/broly_height_base_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/anonytun_pro_apk_mirror.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5229/2513/files/65352952917.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/social_psychology_textbook_aronson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/kopuredukopagarixazavudi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8398/7096/files/campione_light_novel_volume_21.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5679/0681/files/23706376135.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/7376543360.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/56884542862.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 1

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_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 5404 bytes
SHA-256: c28c91144f88a75418ce1861c5709bfc681d6c9dfa4aa4699f01da623b52eafa
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 14704 bytes
SHA-256: a87ea1edfb2f1925ed9d190a614acd70ca7c32c000789d5caa930128d5036766

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