Malicious PDF — malware analysis report

Static analysis result for SHA-256 7770093a4c9ba86c…

MALICIOUS

PDF

87.1 KB Created: 2021-02-24 09:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a8b3ef5946f8047141321272fffde939 SHA-1: 7e7c8d6997b8661c2a71594e3169d4cf90734bd1 SHA-256: 7770093a4c9ba86c6b253feb356d52139990dfd16b7e30d1621469176f72b32c
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to downloading games, which is a common tactic for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable hosting further supports a malicious intent, likely to direct users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/strik?utm_term=how+to+download+games+on+a+ti+84+calculator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_6035429b46b77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446917/normal_5ff294a8b1bb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367905/normal_5fcf5baf89108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_600bc97158d32.pdfIn PDF document text
    • https://kunaxujo.weebly.com/uploads/1/3/1/4/131406864/85327a3495550a5.pdfIn PDF document text
    • http://maxist.ru/semuzosivijojokokiwile7pd.pdfIn PDF document text
    • https://dubiriji.weebly.com/uploads/1/3/1/4/131406762/4671466.pdfIn PDF document text
    • http://mafewagidimu.22web.org/62693549206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_602b89737253e.pdfIn PDF document text
    • https://xotomunekezej.weebly.com/uploads/1/3/1/0/131070571/jojogazev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifarir.rf.gd/vibexoxovolupatafoguken.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_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 5592 bytes
SHA-256: b83600bfb2efb77ec6a3430cac27bef5d7ec82bfa4a21256f16b2bb5dad9d070
font_01_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 12096 bytes
SHA-256: 243a0ad51afc5eab8a54e2e5e7bb4e149e6c62daf9bdd58340d128f81f7010cf

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