Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e9775a2ec9b0c8…

MALICIOUS

PDF

40.0 KB Created: 2020-08-31 05:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 284bb99d7c3cb9d6367a49f0626a7818 SHA-1: 42167d24b73f1be859ba933df92b6754bfda64b7 SHA-256: 92e9775a2ec9b0c818d13a378b4c032227eec900416df3519f400136eb3ec9e0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL and numerous other URLs pointing to static.usrfiles.com and cdn.shopify.com, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=concha+buika+no+habra+nadie+en+el+mu
    • https://static.usrfiles.com/ugd/affb4a_0dd708be0080452887577b2aec8d55ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdd3d76c3f8547e69e103a70e265f844.pdf
    • https://static.usrfiles.com/ugd/b8c837_042007822ad24e519d279f0d3604b673.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e3b4622226e425fbc95cc7d4cf7127b.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_a3ed8490e94248a8994dd9ce18ec2107.pdf
    • https://static.usrfiles.com/ugd/b8c837_18b4dcb7af6a4cc18f8d0f2ff2453413.pdf
    • https://static.usrfiles.com/ugd/5de1df_4428500728af42f9b942601df29a2375.pdf
    • https://cdn.shopify.com/s/files/1/0434/7428/8793/files/techniques_of_grammar_translation_method.pdf
    • https://cdn.shopify.com/s/files/1/0439/8625/6030/files/kijejivujowawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/47435343168.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/5910101828.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/7128076932.pdf
    • https://cdn.shopify.com/s/files/1/0436/1761/6034/files/rujab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9394/1671/files/zamobasobebarop.pdf
    • https://cdn.shopify.com/s/files/1/0462/1854/3258/files/digital_art_commission_contract.pdf
    • https://cdn.shopify.com/s/files/1/0464/2488/3352/files/plan_de_meuble_en_bois_gratuit.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_off00005b95.bin
fa18a676cdba0dd453f9fa43980dbd9aecc6398f209a9c771a5415d1b7e8474b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B95 5112 bytes
font_01_sfnt_off00006cbb.bin
5fba510fb7688ac83e6d3808cd9051b5b4a5dc770dc94074728e3570cd760c5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBB 11728 bytes