Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdfe7d67506b6c0…

MALICIOUS

PDF

46.9 KB Created: 2020-08-23 06:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa1676b2429e8c8395975a79b029414 SHA-1: 8cf5d6e520dae9c4b5eb13b79ef3e0b8207dd502 SHA-256: 0cdfe7d67506b6c0e45b613f40dcd2da1a6336ae8756215d7329b974f02f5f10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.com'. This heuristic, combined with the ML classifier's high confidence, indicates a malicious intent to redirect users to potentially harmful content. The document body itself is heavily obfuscated and contains a URL that mirrors the malicious redirector.

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=chhota+bheem+and+krishna+kirmada+movie
    • http://files.diaetguru.net/uploads/1/3/2/7/132740285/bdeaab937e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/61220373516.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0430/9860/3669/files/xusabuzudim.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/puvotore.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/43120876262.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/after_effects_cc_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/jideva.pdf
    • https://cdn.shopify.com/s/files/1/0450/4079/5806/files/assignment_method_in_operation_research.pdf
    • https://cdn.shopify.com/s/files/1/0439/0223/8875/files/skf_bearing_unit_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/kiziwapukafazulosefezev.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9122/files/mixed_bag_crossword_answer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f33.bin
33a385a63bccd0afec5e3476327a9f7b170f16f697e7c432f6302c9061cd3357
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F33 5204 bytes
font_01_sfnt_off000070bf.bin
7abf3151dbd554bc69c54609fac88ac85ab78a860b2a63c2aa1b7c0a66ac2df5
pdf-font-stream PDF embedded font (sfnt) at offset 0x70BF 12128 bytes
font_02_sfnt_off0000985c.bin
498f6068b66fad9b0c11e1c49bd3838004d5217f49a4af5003c64164b7a90c00
pdf-font-stream PDF embedded font (sfnt) at offset 0x985C 16512 bytes