Malicious PDF — malware analysis report

Static analysis result for SHA-256 32dd3e3e870bf738…

MALICIOUS

PDF

38.9 KB Created: 2020-08-30 15:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aa0a4911eeb16619b16431b4c27e598 SHA-1: 8d89726a91c71681c3eea8299c12d2dd24e3f0a5 SHA-256: 32dd3e3e870bf73825ae23e5d2d2e5490c2c7adad0e07d59297c97272ebd8fad
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high ML classifier score and the presence of numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=que+pena+tu+boda'. Another critical heuristic indicated a link farm with 22 external PDF links, many hosted on cdn.shopify.com. The document body contains garbled text but includes the suspicious URL and several other PDF links.

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/wix?keyword=que+pena+tu+boda
    • https://static.usrfiles.com/ugd/b8c837_620011206012453e89e1da7d9a111f2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a69288762fdd4d4e88a891d3cd457972.pdf
    • https://static.usrfiles.com/ugd/30e015_96a6881ca64b477690fbf8150410a213.pdf
    • https://cdn.shopify.com/s/files/1/0432/1250/5243/files/95801839417.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9645/files/fahrenheit_451_study_guide_answers_part_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/55354885072.pdf
    • https://cdn.shopify.com/s/files/1/0465/3252/6238/files/dozev.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/6004492109.pdf
    • https://cdn.shopify.com/s/files/1/0429/4954/2041/files/zuvokelubukijitik.pdf
    • https://static.usrfiles.com/ugd/01e791_e3c77f8cf2d34aadb7362356024e3f84.pdf
    • https://static.usrfiles.com/ugd/b56239_b7d579d6921e4a56b9e8789f951326d4.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_off0000597a.bin
b52c29a2a97aa6540ced2985aea60c8667892ed627a422059a3a8918169f3b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x597A 4848 bytes
font_01_sfnt_off000069fb.bin
4a5066992a1bd3e99cd69eb37f7592f1c584ef710d7f57d8d3e16de7cb883aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FB 11204 bytes

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