Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b97ecc3e747f3fe…

MALICIOUS

PDF

46.4 KB Created: 2020-08-16 15:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb1b6623be401406d0e8a1ba54f74cbc SHA-1: cfbac1427bd514c107f9a063533ad6e6d1ed51a3 SHA-256: 7b97ecc3e747f3fec44295cd34001c3dcf988539af5030dc7846cd58b2557078
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as a free download for 'Tetris free for mac os x'. This link redirects to a known malicious redirector. The document also contains a large number of links to external PDFs, likely for SEO manipulation. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=tetris+free++for+mac+os+x
    • http://files.visionsworkshops.net/uploads/1/3/1/4/131453855/c515dd3407f9.pdf
    • http://files.brandheroesacademy.com/uploads/1/3/1/8/131856491/14feb4d1ab3.pdf
    • http://files.alamedanavyleague.org/uploads/1/3/0/7/130738720/fb4989322d02ca6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/1999_toyota_camry_repair_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0931/files/51862296102.pdf
    • https://cdn.shopify.com/s/files/1/0427/7331/5740/files/crown_came_off.pdf
    • https://cdn.shopify.com/s/files/1/0434/6960/2978/files/29953711533.pdf
    • https://cdn.shopify.com/s/files/1/0434/6164/0352/files/78460033246.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/translation_french_to_english_file.pdf
    • https://cdn.shopify.com/s/files/1/0434/0262/5178/files/jorajoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/8926/4794/files/surgical_anatomy_abdomen.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/kegepigid.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/10060026676.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7305/files/ditesoxiwogisisokomoso.pdf
    • https://cdn.shopify.com/s/files/1/0433/3584/3994/files/local_guide_of_vatnajkull_iceland.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cee.bin
012b9c31f465fa13e3ffde1046bb7894042493045974534a06d4377cd399db62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEE 5012 bytes
font_01_sfnt_off00007ddf.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDF 1800 bytes
font_02_sfnt_off0000866d.bin
bb97059abb7168da290bac2d17e9fcc6c137f8092f10c58e6d7860e5cf7eb93e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x866D 11192 bytes

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