Malicious PDF — malware analysis report

Static analysis result for SHA-256 771e0f52e77e4d3c…

MALICIOUS

PDF

42.1 KB Created: 2020-08-15 00:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 393ff66fa49a23449f75f8e5470b9d16 SHA-1: 372e84695aae0ce7e5e59c49a9daeb088bb3c2de SHA-256: 771e0f52e77e4d3c076a4f26dcdff96e2db0bdd0294feebea5b7e0355d8ee203
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Android rpg games best graphics' and the malicious URL, suggesting a lure to entice users to click through to potentially harmful content. The ML classifier strongly indicated maliciousness.

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=android+rpg+games+best+graphics
    • http://files.atlanticconfederationofclubs.com/uploads/1/3/1/8/131856146/jixobilujiz.pdf
    • http://files.chesapeakewoodartisans.com/uploads/1/3/1/8/131871618/4c1ac1a95880.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20880330559.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71419102660.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/11926781045.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/18832211305.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/63837927548.pdf
    • https://cdn.shopify.com/s/files/1/0433/4734/5573/files/69450003424.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/base64_image_to_php.pdf
    • https://cdn.shopify.com/s/files/1/0431/2524/4053/files/sonamoxowanipab.pdf
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/zipumefi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/o_bewafa_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7049/files/17127846464.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b9.bin
fb52452c5f9f7879ae0085d4b13ce9e7295e3210abf05b0f189c701e3181017e
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B9 5584 bytes
font_01_sfnt_off00007780.bin
1a27a266b1dc62d85583b9d7eede776e96640c60324f6319f2030e0add307bc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7780 10624 bytes