Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b8bf2cc2d23e22…

MALICIOUS

PDF

43.0 KB Created: 2020-08-07 00:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e702f0a9465de48c4754213374f51cfb SHA-1: 17f408fb46a0a212c744b5b4955e505f3f2d2cc5 SHA-256: a9b8bf2cc2d23e227fd381bcf005a465e2b5c036209c39133137f8702cc229fe
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a customer accident report form. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL pointing to 'ttraff.cc' strongly indicate a phishing or redirection attempt. The PDF also contains a large number of external links, many hosted on Shopify, which is characteristic of SEO link farms used to distribute malicious content. The ML classifier also flagged this PDF with high confidence.

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=customer+accident+report+form+pdf
    • http://bovup.myersturning.com/uploads/1/3/1/6/131607131/8917895.pdf
    • http://files.hampshiremanagement.net/uploads/1/3/2/6/132682022/fewemominavofad-wulikozevoboda-rowimajunufof.pdf
    • http://files.inspiredft.com/uploads/1/3/1/4/131405948/4017639.pdf
    • https://cdn.shopify.com/s/files/1/0430/4453/6473/files/85798904327.pdf
    • https://cdn.shopify.com/s/files/1/0438/7602/4475/files/51663307950.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/fedifuridabajow.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/papezebixuretexeduwuze.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/napakozapavu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2886/3397/files/47681182000.pdf
    • https://cdn.shopify.com/s/files/1/0438/3653/9045/files/82140055630.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3286/files/altium_designer_tutorial_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9829/files/toruvolekogokuji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6584/3620/files/weight_watchers_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/business_plan_procedure.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_off00006b8c.bin
7b33dc8ac5d9c0341a68bed7ff48a71cc0685c5ee862dda67b755e10094b4453
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8C 5172 bytes
font_01_sfnt_off00007d05.bin
7371b52db403f52654000764a3d0a14629f08aced80bd19f2426065f362c8258
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D05 10084 bytes