Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4ebf4b8a891987…

MALICIOUS

PDF

44.3 KB Created: 2020-08-22 19:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de9c5078ef5f218af398934b6e660ce3 SHA-1: ea8dbf88f7b79a4225f15bcbf56ad5539be4ecfd SHA-256: 9c4ebf4b8a891987491f8cb3e9d6820d34dd8fd0586ad79092eff2ded896e0ac
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a product size guide. It also features a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The presence of obfuscated document body text and multiple embedded URLs indicates an attempt to disguise malicious intent and potentially lead users to further malicious content.

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.ru/pify?keyword=rab+microlight+alpine+jacket+size+guide
    • http://virewiwew.secondstoryhoney.com/uploads/1/3/1/0/131070894/bb3aa89b1b1acd.pdf
    • https://cdn.shopify.com/s/files/1/0434/6747/3046/files/zandalari_rep_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/82680526397.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/smith_organic_chemistry_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/64486909391.pdf
    • https://cdn.shopify.com/s/files/1/0459/6875/2807/files/forgot_password_email_template_bootstrap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/katodijedef.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8696/files/1416731191.pdf
    • https://cdn.shopify.com/s/files/1/0435/2235/9451/files/kindergarten_worksheets_math_counting.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/89568227499.pdf
    • https://cdn.shopify.com/s/files/1/0440/1784/4382/files/bamini_tamil_font_layout.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_off000066a7.bin
6dccd9fdd2875daa81f882bd57a10976af63beb8ffa062627e5f8b048a6b4f68
pdf-font-stream PDF embedded font (sfnt) at offset 0x66A7 5824 bytes
font_01_sfnt_off00007a4f.bin
3af641722c6520f08bfbd9d7745c9f870cb2ab55ab1bbd5e04bf41222068d1ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4F 13076 bytes