Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e0093c188eac6a…

MALICIOUS

PDF

45.4 KB Created: 2020-08-22 14:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22fbefd48b980be833d62589cb216805 SHA-1: b490b968da612204eaf1dd525143ef1ff56c249a SHA-256: b2e0093c188eac6a47d1103096e8b0c5fdaf327b8ab6b6077c2f3aeafd69e7c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, with a critical heuristic firing indicating a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious redirector URL and several other URLs hosted on Shopify and other domains, suggesting a link farm designed to lead users to malicious content. The primary malicious IOC is the ttraff.cc 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.cc/pify?keyword=ampscript+date+format
    • http://files.courtneymillerpilates.com/uploads/1/3/0/8/130815381/3484274.pdf
    • http://files.northshorebostonrealtor.com/uploads/1/3/1/6/131606289/653055.pdf
    • http://xizetirop.pathwaystostillness.org/uploads/1/3/0/8/130873947/rebabaxoluzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/36485652751.pdf
    • https://cdn.shopify.com/s/files/1/0462/2640/7575/files/c_stringbuilder_append_string_format.pdf
    • https://cdn.shopify.com/s/files/1/0447/5607/4645/files/3d_car_design_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/82917322426.pdf
    • https://cdn.shopify.com/s/files/1/0434/8333/2772/files/42013537730.pdf
    • https://cdn.shopify.com/s/files/1/0448/9661/6615/files/creative_cloud_no_credit_card.pdf
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/wigawa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4756/7010/files/batteries_used_in_electric_cars.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a60.bin
73dd23205a359eb32a76643945fe6fcfbeffd78e2574b4a88c884d5006519d9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A60 4940 bytes
font_01_sfnt_off00006b23.bin
151b38577dae2d139be1eef294b48a100bf7149e1628b9b1e097ef349c6a3812
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B23 15224 bytes
font_02_sfnt_off00009b23.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B23 4324 bytes