Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b3e5f37199a6a5…

MALICIOUS

PDF

39.9 KB Created: 2020-08-03 18:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2105d9a23b4d051f7af003a7d5811ade SHA-1: 1237be7fb3917f413fc6b769e45bf4509033f6b5 SHA-256: e9b3e5f37199a6a52bb3a8c612b9619db59506e2df34627856b6b59f832d1701
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body also contains numerous embedded URLs, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or content distribution network used for hosting malicious or benign files. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a link that leads to malicious infrastructure.

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=pentecostes+hernandes+dias+lopes+pdf
    • http://files.dcganshalom.org/uploads/1/3/1/4/131438069/4248582.pdf
    • http://files.franklinwatershed.org/uploads/1/3/2/6/132681153/6216575.pdf
    • http://files.benkipiyako.org/uploads/1/3/1/4/131407635/7393538.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/31894176577.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/pepokufalikogesuvemusedaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/15604352736.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8053/files/71474336716.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/laloxifanagofuzutam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/18113857430.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/50910172147.pdf
    • https://cdn.shopify.com/s/files/1/0430/8189/1989/files/pumimesarorutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewobaropelizovijekozuji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2882/files/xipaxizexike.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/didupemejixutepiwidut.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/68297948221.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/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewobarope

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005907.bin
0e068c6a51de5474f1692c50f68511d66d44abdabdcfa732af1c94a6a4feb89c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5907 5244 bytes
font_01_sfnt_off00006ad7.bin
c909a5af34b39359d76588e581602eadfc6533be38f017fcd0784a81017bea4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD7 12384 bytes