Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a6e8404c9f4b60…

MALICIOUS

PDF

99.9 KB Created: 2020-12-24 15:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4daaf1a555c76c6dc2368515eb4e2024 SHA-1: 47cebfa706f067399c743485d8b9fba5e66b8f02 SHA-256: 25a6e8404c9f4b607ddf3973edfd39d6ba743f7c49c9bbf4256a0d4cf024c0d0
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm for distributing malicious content. The document body, though heavily obfuscated, appears to be a lure for a game mod, which is a common tactic for phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=fantasy+league+turn-+based+rpg+strategy+mod+apk
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/8661809.pdf
    • https://cdn.sqhk.co/kowazodonaf/8Ygc2jj/salolupazogowijomo.pdf
    • https://static.s123-cdn-static.com/uploads/4409403/normal_5fe1b20eae066.pdf
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/sowenexun.pdf
    • https://guratebiliwabop.weebly.com/uploads/1/3/2/6/132682790/0db84.pdf
    • https://cdn-cms.f-static.net/uploads/4454287/normal_5fb778d4a775a.pdf
    • https://cdn.sqhk.co/nerutamar/gdALhaF/wordscapes_level_8255.pdf
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5f9b20474c18e.pdf
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/firutaxiguzaxuda.pdf
    • https://cdn.sqhk.co/zipuzedozame/eigPasl/jungle_castle_run_game_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a11ca20-9143-4999-a08d-cff7feb985ec/divinity_original_sin_adventurers_weapons_worth_it.pdf
    • https://uploads.strikinglycdn.com/files/773eca93-2318-4722-8fa9-f18b4960ab6b/exchange-traded_funds_for_dummies.pdf
    • https://uploads.strikinglycdn.com/files/7f2c0413-fe1f-4e8c-95eb-5e2849638cea/padukafitunobidapipavapal.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015724.bin
46f01c16ae8fc6a4b9d5b671a585242f55d2991697d39d09a205d613df08e60c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15724 24812 bytes
font_00_sfnt_off00010bd9.bin
c8b663a3c3d6c010f014bff23f111ac8bb16ee5ad0fe28b8b69e41af1377aceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 3376 bytes
font_01_sfnt_off000117ef.bin
23c2ca3348198bce54520f22d90aae346786502576d2987cfb3acfc70be924de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 5572 bytes
font_02_sfnt_off00012adc.bin
2ab03c16e064db5280b43c46f3f4b09baf39c76a5d968ee86b890deadc49edb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 14216 bytes

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