Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b851b83b06fc974…

MALICIOUS

PDF

40.5 KB Created: 2020-08-24 22:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3681a4eaf892db68b1840048640d688d SHA-1: d07455555786e88a06023dfce6b45377501c2d0a SHA-256: 8b851b83b06fc9741d0656a7f88942d8213e38910c08c4d3994e6a3bd92cf05f
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a link farm strategy to obscure the ultimate malicious destination. The document body, though partially corrupted, contains keywords related to educational material, likely a lure to encourage clicks on the malicious links. No scripts were extracted, and the primary malicious activity is the redirection via the embedded 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=tnpsc+aptitude+questions+answers+in+tamil+pdf In PDF document text
    • http://files.mreasthamclass.com/uploads/1/3/1/8/131871864/14c320f14.pdfIn PDF document text
    • http://jotofopal.healdsburgflowers.com/uploads/1/3/2/3/132303307/ccfaf14e.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/1/0430/8375/9765/files/tony_hawk_pro_skater_2_rom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1712/5536/files/california_dmv_test_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/2309/6997/files/sawofibajokatigemize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0095/4021/files/mepezukelogududelox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5813/4168/files/81716249016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/1929/6922/files/dajokowinulodexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/abstract_nouns_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/xekuradalubor.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 4

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_off00005f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1C 5468 bytes
SHA-256: 3e86b7bb7373a241dfd8d9be6ee93e346385d8e4c65853896331ce49bc8d32c9
font_01_sfnt_off000071a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A5 10540 bytes
SHA-256: 5568c4e928eb46c6f039b7701f42f5611fa08b4dd4bb10b75fca6e3416992b9b

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