Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f04438f98e8425f…

MALICIOUS

PDF

39.9 KB Created: 2020-08-18 13:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8e10b0a6e27be02399cab496536dfdf SHA-1: 4013fd13b1a4273440df07787aa0cad8e4d2fbb7 SHA-256: 6f04438f98e8425fd190a8c355b4b3b2c2a98656b4302cded763a2e23cd9f642
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the heuristic firing. The ML classifier strongly indicates maliciousness. The presence of multiple external PDF links suggests a link farm, likely for SEO manipulation or to obscure 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=apartment+owners+association+rules+and+regulations+pdf
    • http://files.vivekashok.com/uploads/1/3/1/6/131606815/xogedurorowi.pdf
    • http://files.my-edutech.com/uploads/1/3/1/0/131069860/0bcf3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4496/1446/files/dr_brian_weiss_miracles_happen.pdf
    • https://cdn.shopify.com/s/files/1/0439/3094/3643/files/o_positive_blood_type_diet_food_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/sukatonamaram.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/android_secret_codes.pdf
    • https://cdn.shopify.com/s/files/1/0440/1525/5710/files/final_fantasy_x_blitzball_luca_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/4621/3544/files/modifiers_tinkers_construct.pdf
    • https://cdn.shopify.com/s/files/1/0435/1524/8794/files/auxiliary_verbs_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/1279/1192/files/graham_crackers_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/46464881686.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/8782536927.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4858/files/git_config_alias.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_off00005e71.bin
335a8cb63ec9642a0d2f9c4cb6e7925cfd846fc7107cf547b6ee407663293160
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E71 5556 bytes
font_01_sfnt_off0000714d.bin
5d034aa8fe57592e6f3acb3e8db7a1c31c735fc9f5068c4059bbee61e53b60c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x714D 9780 bytes