Malicious PDF — malware analysis report

Static analysis result for SHA-256 6256f2c882fc35c7…

MALICIOUS

PDF

44.4 KB Created: 2020-08-24 16:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 342a4e7147ed9ba48a133bd9e0ea6788 SHA-1: 2cac088dc6406836124bce394f99f9305205cb7e SHA-256: 6256f2c882fc35c7ed9e3773c8e3c49daf4bdac4ba2a1fb4366a6734acf0e72c
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious redirector URL and several other PDF links, suggesting a link farm or SEO manipulation tactic to distribute malicious content.

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.com/pify?keyword=cloudformation+lambda+function+template
    • http://files.luisaluisa.com/uploads/1/3/1/8/131856191/5741675.pdf
    • http://boxid.beaurobertspianist.com/uploads/1/3/0/9/130969077/3687280.pdf
    • http://jatowi.malliefe2o3.com/uploads/1/3/1/4/131437615/8725480.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0936/7454/files/movimiento_rectilineo_uniformemente_acelerado_definicion_fisica.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4124/files/somegobugipifes.pdf
    • https://cdn.shopify.com/s/files/1/0456/8422/8255/files/guide_specification_for_seismic_isolation_design_aashto.pdf
    • https://cdn.shopify.com/s/files/1/0466/7179/0245/files/wulupesakenipexobawava.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/lixusananuvofedepowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/keronevodumetojovakal.pdf
    • https://cdn.shopify.com/s/files/1/0448/4349/9677/files/arabic_writing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/what_is_a_saddle_point.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/anjali_dj_song_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9610/5375/files/gemonuwamejaxirekemowole.pdf
    • https://cdn.shopify.com/s/files/1/0437/8168/5406/files/suropiren.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19941062624.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/13112989739.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068ae.bin
e21e654de8353ebd5f18928905ab1fd560a1c593b964f920bd4116e67ce7c483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AE 5168 bytes
font_01_sfnt_off00007a24.bin
83661e441509da0f71b753441fb5147432dc552449bf7c49787639a331d6b792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A24 13156 bytes

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