Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacaa5be59950473…

MALICIOUS

PDF

46.3 KB Created: 2020-10-26 00:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e25f1aaaa1866b9c3ab2b6cf1ea64389 SHA-1: 45c8185fe17d43cc1da99da3fda8b1f845a70b8e SHA-256: aacaa5be599504736953077c72a7a351f42bfb3d5340418919571d6df0a5e641
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links designed to appear as legitimate book downloads, but one critical link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=statistical+learning+theory+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f93a14240194.pdfIn PDF document text
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/bufav-xiragut-muwofigipek.pdfIn PDF document text
    • https://jomojakadawubo.weebly.com/uploads/1/3/4/4/134448567/xipedivivaw.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/1/0488/1488/2981/files/kakebixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/5096/9529/files/22418947497.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/4456/8989/files/posafej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9523/7813/files/daxinemunabaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5924/8797/files/lummi_indian_business_council_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5fad37-02f6-4fc9-a358-37e6d3c431bd/11266754902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb1f791-c264-4b48-b36e-3436987c96de/98280332943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/nufomusapevi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/8794/5622/files/jabimimedez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4063/5542/files/ducky_one_rgb_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3500/2533/files/buying_ready_made_curtains_size_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9319/5455/files/fundamentos_de_limnologia_esteves_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5644/2777/files/cours_de_maintien_dordre.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4155/3046/files/contoh_proposal_penelitian_kualitatif_lengkap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8950/9017/files/binary_domain_trophy_guide.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000754d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x754D 5824 bytes
SHA-256: f3bed54da091368ab716937b6a8a6d21b7cf564fe5ce09131cfaba84bacb3c05
font_01_sfnt_off00008909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8909 10156 bytes
SHA-256: a3cfbdfd654fa93634c1f97128e9134a63b8ab7a790c3931e126aa09794ffccb

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