Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfb69952e7b4dc2…

MALICIOUS

PDF

49.9 KB Created: 2020-11-04 07:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a793c95f3542ea7dc886e8ca518bd60f SHA-1: 1cf4a4f31bae1bc27dee2220411dc32a3c421134 SHA-256: 7dfb69952e7b4dc25fe39d7e90d804f31b71ac00be61270f697cce373ab73916
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, including a known malicious redirector. The document body, though heavily obfuscated, contains references to a 'Worx chainsaw owners manual' and a URL, suggesting a lure to trick users into visiting malicious sites. 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://ggtraff.ru/strik?keyword=worx+chainsaw+owners+manual
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/1196878.pdf
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8d5c95ad1e1.pdf
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/kofofazigetozig.pdf
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/5711090.pdf
    • https://zunifoxorim.weebly.com/uploads/1/3/4/3/134320692/5e99a152e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/60fd559e-52b5-46f9-8f76-0633067a84ca/kepaluzaxilur.pdf
    • https://uploads.strikinglycdn.com/files/2766f69a-97ec-4ab5-bc98-1c3b9263acd5/kowodapa.pdf
    • https://uploads.strikinglycdn.com/files/e70065f7-390f-481d-8a18-712d1eda27c7/no_module_named_sklearn._impute.pdf
    • https://uploads.strikinglycdn.com/files/e3da1000-ef2e-42c9-badb-f25aa64f9e2c/41559052311.pdf
    • https://uploads.strikinglycdn.com/files/6d8830a4-bb69-4277-8657-c9ccc0a8e2cf/64193218770.pdf
    • https://uploads.strikinglycdn.com/files/660ddf43-331d-4af5-8d89-275d38f41995/45326386541.pdf
    • https://uploads.strikinglycdn.com/files/8907c9a2-4c06-41b9-8768-60bc81814481/snare_drum_solo_music.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d2f.bin
e3ab335ef092b7fe808871aa80e3f703c0ac81eaab1e76a175d7f3e41907d7d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2F 7152 bytes
font_01_sfnt_off000074da.bin
e8f7ce65c9930b5b126f4302d946aaf533cc99b533d4a17954a82ba5b8ae4c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DA 5012 bytes
font_02_sfnt_off000085c3.bin
c71f27b8599e838cbe704d3b2b532d019e4f52d62182878555d7d9a9e4baf7e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C3 11320 bytes
font_03_sfnt_off0000acad.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACAD 4324 bytes

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