Malicious PDF — malware analysis report

Static analysis result for SHA-256 b791227b177538cc…

MALICIOUS

PDF

35.3 KB Created: 2020-08-29 20:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0db8b466f0356ab00744badf13041e2e SHA-1: cc46e7e41917f60cba7c15f6fedcc33d4d2560e5 SHA-256: b791227b177538cc22e6eace11905ac540dae729ca5dd95fd6704fca2fae4bf9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to distribute malicious content. One of the primary links directs to 'ttraff.ru', identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to lure users to harmful infrastructure.

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=logitech+z-5500+digital+service+manual
    • https://static.usrfiles.com/ugd/6df952_464b299b715342f39117e400727f4d5b.pdf
    • https://static.usrfiles.com/ugd/5ad03d_dad2c650a6254536be09d51290a73a15.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_1079e788249b4c9e85f59076b4910343.pdf
    • https://static.usrfiles.com/ugd/66c878_d1f68360b06444f08ffe9cbb2cc508c6.pdf
    • https://cdn.shopify.com/s/files/1/0432/9167/2736/files/birdman_movie_english_subtitles_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/el_seductor_de_la_patria_resumen_por.pdf
    • https://cdn.shopify.com/s/files/1/0452/0011/3813/files/privileged_and_confidential_letter_template.pdf
    • https://static.usrfiles.com/ugd/43d598_b464fa883a044e5c9bbe546a2f70abcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_af9f47ef1d0647a697260afccf296c92.pdf
    • https://static.usrfiles.com/ugd/b8c837_e981f0564dc942ea90d5373a1c1608a4.pdf
    • https://static.usrfiles.com/ugd/2ac701_bfc5865f044240edac8a6a4840240465.pdf
    • https://static.usrfiles.com/ugd/b8c837_36f7b59afc5649c2bc91e369dbab2403.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/jujonaxedizomokujibutidup.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/96769960774.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/71339195112.pdf
    • https://cdn.shopify.com/s/files/1/0431/9507/2673/files/topawegipim.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/genetics_and_cell_biology.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_off00004a3a.bin
265ee90580a4fecea05ef4ab191df7339051b5ba6a19d44b570b96bc7ca69cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A3A 5704 bytes
font_01_sfnt_off00005d92.bin
22b2edb803b648db6e23fae1066cd11265abe96f39e64fb46e3e0579c78a3dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D92 10200 bytes

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