Malicious PDF — malware analysis report

Static analysis result for SHA-256 0432957bb9ec85ec…

MALICIOUS

PDF

42.0 KB Created: 2020-09-16 14:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6513a43b3ae98db55870eede1540f1e8 SHA-1: 261642ae86f97c46f06febc8855de3944dab2864 SHA-256: 0432957bb9ec85ec7e10d2724ab41f6168f38fc508098b9f2a75982a747f5ea6
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the malicious infrastructure. The presence of numerous links suggests an attempt to distribute malicious content or conduct phishing by directing users to external sites.

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.club/pify?keyword=mgb+engine+swap+v6
    • http://files.trustinrealestate.com/uploads/1/3/2/7/132740951/d305e98.pdf
    • http://files.jlangevine.com/uploads/1/3/0/7/130775027/6931975.pdf
    • http://zatamag.kreativtouch.com/uploads/1/3/1/4/131410227/8812941.pdf
    • http://mavival.sdlsf.org/uploads/1/3/1/4/131452977/23001abe5d0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cad22bb-f436-4d00-9745-f22079919e97.filesusr.com/ugd/565485_cf52861f3cc04bb69e1e9317991e4f51.pdf?index=true
    • https://c1b191b9-3160-4acf-bdfc-346f3c4b51e9.filesusr.com/ugd/10a4aa_6a3a43dac9524aed9669d006b9f64a42.pdf?index=true
    • https://2d79f449-54f4-4c85-94a0-f5e41d6a6aa4.filesusr.com/ugd/c722c2_21f3169b387d41e0926c0cf9731188ab.pdf?index=true
    • https://05147c5a-db15-4767-9189-b493e29319d9.filesusr.com/ugd/4b874d_6daff21b76ca4f16910c0dff827c9b83.pdf?index=true
    • https://25da1cd9-757e-43ee-9329-40fe05072c31.filesusr.com/ugd/33ab24_cfd4aa60e50b4f3d9ebfbf6db5726e6a.pdf?index=true
    • https://dc64c36e-b937-4071-8e96-1951ff7fc96b.filesusr.com/ugd/4329d7_e11a226ce07d4b2ba9fd2d204e50d5ed.pdf?index=true
    • https://925395ae-2e93-49e0-a102-3ed5d468b554.filesusr.com/ugd/aef5b7_f3d02f2652944350adaa09c13ab10d2b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/reduced_adjective_clauses_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/angoisse_dfinition_psychologie.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/wupabeluwevukovodevobirig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000653b.bin
2e45b557715393315182640c08f69e2a7778735976838cd49c11d4c1d04840f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653B 5312 bytes
font_01_sfnt_off00007789.bin
6dc1e74fae71b77457719c2b77637142494daabac16a45c1a68b07de2be9c776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7789 10468 bytes

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