Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd845955571408e…

MALICIOUS

PDF

46.6 KB Created: 2020-08-09 09:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7969dd1c303a1c559d2704e5476fbf3f SHA-1: 88aae98d096f40ccdc8caca53c9c6c7321e07c82 SHA-256: 8bd845955571408e03ab5f03b449588588a85117fe0cf093d3a156613aca82c0
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'marine ecology textbook pdf' and a URL pointing to a redirector. This suggests a social engineering attempt to trick the user into clicking the malicious link, likely leading to further malware download or phishing. The presence of multiple Shopify URLs indicates a link farm strategy.

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=marine+ecology+textbook+pdf In PDF document text
    • http://files.dhub09.com/uploads/1/3/1/4/131454984/3832329.pdfIn PDF document text
    • http://files.anchoryourfootprint.com/uploads/1/3/1/6/131606011/591c8.pdfIn PDF document text
    • http://files.josezayaspr.com/uploads/1/3/2/6/132680890/nevoje_zupabotipuvalop_marikug_niroziv.pdfIn PDF document text
    • http://files.winshipart.com/uploads/1/3/1/4/131437194/7510410.pdfIn PDF document text
    • http://files.benetvolleyball.org/uploads/1/3/1/8/131857115/1964443.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/1/0434/3152/6561/files/snap_hack_no_survey.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/all_medical_laboratory_apparatus_and_their_uses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3156/8277/files/23644998942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/najosezemibamonasanezip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1597/7630/files/vuxojekodunula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6001/6790/files/minecraft_attack_of_the_b-_team.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4181/5718/files/classroom_management_strategies_for_middle_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/41518724470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/54312755101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/2001_honda_cbr_600_f4i.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_off0000783d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x783D 5524 bytes
SHA-256: e7ace3da263dd336ebb16b5920862451be4e60d2df1d4d83d9844ff927622c43
font_01_sfnt_off00008b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2F 10156 bytes
SHA-256: 8c135c42fc6eb30f18a5179027472e74bcb1b87365357b1de824ea2c5a1e44e6

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