Malicious PDF — malware analysis report

Static analysis result for SHA-256 637f4602d6f8b955…

MALICIOUS

PDF

50.2 KB Created: 2020-08-19 06:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21cfe43e7c394be47c512aa7b05abfac SHA-1: db7634d3cc534938b9f493dc706940bfb98b357c SHA-256: 637f4602d6f8b9552472992178499ade7484a9012a4fb4c184f3aee86fd94b33
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body itself is heavily obfuscated but contains the malicious URL, suggesting an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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.ru/pify?keyword=adzan+padang+pasir
    • http://files.drvinge.com/uploads/1/3/1/3/131380456/90907bb6.pdf
    • http://sidesa.artistsabroadhk.com/uploads/1/3/1/3/131380600/wawovus_xakodojawoza.pdf
    • http://nafaxenu.farmingo.org/uploads/1/3/1/3/131398020/8439588.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/37978229425.pdf
    • https://cdn.shopify.com/s/files/1/0437/5012/9813/files/xenuduferoxugeje.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/60277289282.pdf
    • https://cdn.shopify.com/s/files/1/0434/8893/6102/files/english_reading_practice_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0440/2439/7989/files/although_however_despite_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/48424828117.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/lowes_defuniak_springs_fl.pdf
    • https://cdn.shopify.com/s/files/1/0438/9847/0552/files/ignou_ba_public_administration_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/consonants_and_vowels_sounds.pdf
    • https://cdn.shopify.com/s/files/1/0433/5858/4986/files/android_os_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0448/0168/7714/files/89775257733.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/vapamilinajasaxabiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/50302889958.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56773010908.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062fb.bin
e459fd8ac2dc7bed644f92a17a855df886cdbd5e530d8db125a1b0d51cde219b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FB 4616 bytes
font_01_sfnt_off000072a0.bin
b18a0411d71ddba35bf01bd7c520b72cde595f412cbd2be3a0a14c64f77d1dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A0 10012 bytes
font_02_sfnt_off00009525.bin
3ab729d7e492746eedb318991b40abd498400539d7b3cfa77971d8a1a88280a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9525 16976 bytes
font_03_sfnt_off0000ad69.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD69 4324 bytes

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