Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f4bae5a1c39326…

MALICIOUS

PDF

52.6 KB Created: 2020-08-29 16:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4dafea6d8c2aa876ee6bcdf8b32788e4 SHA-1: 6bac4e3ecbcfb6534ebc09938adb52f0e5331407 SHA-256: 88f4bae5a1c3932602bbf66332104b6920f145ce89dfd622f8fb6d459ee2e0ea
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.cc) which is flagged as malicious. The document body and heuristics indicate a link farm strategy, likely to distribute malware or phish users under the guise of providing free educational worksheets. The ML classifier strongly indicates 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.cc/wix?keyword=genel+konik+denklemi In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/multiples_worksheets_for_5th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/fanen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/vovon.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_afc8f188e4a548d1bacb7fcad7aeffd4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/reported_speech_mixed_types_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/12100016495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/kickboxing_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4887/6697/files/project_estimation_document_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/white_wallpaper_background.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/98613082855.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 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68E7 2884 bytes
SHA-256: ebc0c66205eecaa15b97408e97b4ca266c1ef79c221d6a066ab8c4dd73ae161d
font_01_sfnt_off00007326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7326 4288 bytes
SHA-256: 727238e380ac5c14bd7b7b90ae432891c5a09791da587a9c7c7580ba7a393d78
font_02_sfnt_off0000818f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x818F 17752 bytes
SHA-256: 130a1745be746b93084a5a25cbe74b1a46b3a702ce17a19933a7d89f256b41c4
font_03_sfnt_off0000b626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB626 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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