Malicious PDF — malware analysis report

Static analysis result for SHA-256 8121f9c130bdb2a3…

MALICIOUS

PDF

47.3 KB Created: 2020-10-04 03:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b8ae1744876a1aba9146df7c5dcbd87 SHA-1: 126bf59a2a58b74df0c31388844519242b22d69c SHA-256: 8121f9c130bdb2a3b242ddad891e34aa2f7af09e625f2c3579fe83bb3daaa575
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?keyword=starbucks+reserve+coffee+passport'. This suggests the document is part of a phishing or scam campaign, likely using the 'Starbucks reserve coffee passport' lure to entice clicks. The ML classifier strongly supports the malicious nature of this PDF.

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://ggtraff.ru/strik?keyword=starbucks+reserve+coffee+passport In PDF document text
    • http://jobejo.charstravelcenter.com/uploads/1/3/0/8/130873995/wetonomig.pdfIn PDF document text
    • http://files.richardhstephens.com/uploads/1/3/1/0/131071157/731797bd05.pdfIn PDF document text
    • http://files.dealingwithstuff.com/uploads/1/3/2/3/132303229/begafobe.pdfIn PDF document text
    • http://files.1stcallrepairsandparts.com/uploads/1/3/1/4/131406506/kotuxekulupane-kinabawavawan-zopel.pdfIn PDF document text
    • http://files.glasskiteanthology.com/uploads/1/3/0/7/130739340/6f56cd63c.pdfIn PDF document text
    • http://files.thelasalleclub.com/uploads/1/3/1/1/131163736/54f7907d65433d.pdfIn PDF document text
    • http://files.mandyyrosen.com/uploads/1/3/0/7/130775897/01886e4759.pdfIn PDF document text
    • http://muboguxet.feistykraken.com/uploads/1/3/1/1/131164250/f720ddbb10f.pdfIn PDF document text
    • http://files.chanticleer-press.com/uploads/1/3/0/7/130739836/1496141.pdfIn 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/1/0481/5244/5079/files/fuse_fortune_persona_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6174/7105/files/31297804421.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/gegasakofivenevewususig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2828/6110/files/the_great_brain_robbery.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8500/2920/files/north_star_tattoo_shop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C29 5072 bytes
SHA-256: 1e8621eab72adade709376121a7634b4c96b2640261fa777d771afcc3e195a30
font_01_sfnt_off00007d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7C 10640 bytes
SHA-256: c718605d6c32bba37391e5f07bef0756af451bf203a70bf4f58e7ed606036cc6
font_02_sfnt_off0000a1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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