Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1b6a1182f23d78…

MALICIOUS

PDF

42.2 KB Created: 2020-11-06 01:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d2f47e7a652149667bbf27c660cb724e SHA-1: 11b88072178250eec378dd1b0d79d70823c96d35 SHA-256: 6c1b6a1182f23d78bef853d15d980dd03f94e7505ec616568a79e6742c033264
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure related to an answer key for a lesson, which is a common phishing tactic. It embeds a malicious URL that redirects to a suspicious domain, likely to host a phishing page or download further malware. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to disguise the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?keyword=lesson+6+skills+practice+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5fa48d18e10d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5f87821c5f4c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5fa47f55294c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_5f94f68c08211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5fa0b5acbf369.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/45_hour_parent_teen_driving_guide_virginia.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/sentence_completion_1_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb57a8f-1add-4047-b916-ef2918fda49f/lekamusa.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/osrs_a_taste_of_hope_quick_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12940ff9-def2-4267-af89-3866f23d2ea7/ruzivurotodig.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/gun_bill_of_sale_tn.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_off00006645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6645 5280 bytes
SHA-256: aebf3ab3e3c4786279b1d53dbd3c751f3dc089ef6627a9d5bd0b09a9a2ac714b
font_01_sfnt_off00007866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7866 10508 bytes
SHA-256: 21f9819709c28e834666086ea2d37cccf787f02a43253125996dac857999c6b9

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