Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc94b2d80b08da5…

MALICIOUS

PDF

49.1 KB Created: 2020-08-22 03:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ca658bdc6fe6cde2f7b8cd1cbaa6aca SHA-1: 66b5fdf2645c6f134bc09c38e7d775edac920278 SHA-256: ffc94b2d80b08da5eb9f94728abd5b08c472d5f4d89f9aa61d79befd4775533a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the extensive link farm and the presence of a malicious redirector are sufficient indicators of a malicious intent to drive traffic to harmful sites.

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=aromatic+plants+pdf
    • http://files.ashliesart.com/uploads/1/3/0/7/130739146/792edad.pdf
    • http://files.bugi3d.com/uploads/1/3/1/4/131438464/720799d23559e1.pdf
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/python_count_files_in_directory.pdf
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/medical_test_report_format.pdf
    • https://cdn.shopify.com/s/files/1/0454/6071/7726/files/42300544330.pdf
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/49405927626.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/68825288760.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6695/files/basic_python_programs_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0437/1342/9655/files/case_interviews_cracked_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/wujifulafukexaxaka.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/dutijanatid.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/tapobomajogaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3521/3467/files/vosez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1741436775.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_off0000739f.bin
6ae85852c5fd864fd4f87b9c490d71537236ba442975415c60e58dea142cf907
pdf-font-stream PDF embedded font (sfnt) at offset 0x739F 5288 bytes
font_01_sfnt_off00008578.bin
d5e3a09876768b035068273e37dea9140ef8f2f65bb9c0ead01e1c11fcc325d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8578 15920 bytes