Malicious PDF — malware analysis report

Static analysis result for SHA-256 b567ac0bb0551e44…

MALICIOUS

PDF

44.2 KB Created: 2020-08-28 00:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdc0879323dea5cc450de97757290842 SHA-1: 77d571b771b6d92e0c26145d11ae63322e5c47be SHA-256: b567ac0bb0551e44c2fe502a5d0406940e8e67623434cb0fca731c1d4b59c982
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to a redirector service (ttraff.ru) which is flagged as malicious. This indicates a link farm strategy, likely intended to obscure the final malicious destination and evade detection. The ML classifier strongly supports the malicious verdict.

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=les+registres+litt%25C3%25A9raires+tableau+r%25C3%25A9
    • http://xuliwan.sharaimage.com/uploads/1/3/1/6/131606490/luxaxadugabexaso.pdf
    • http://files.collectorsshowcaseglass.net/uploads/1/3/1/3/131380158/124181ab4e.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/shopify_contact_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/zunibupalejelutegugoruku.pdf
    • https://cdn.shopify.com/s/files/1/0437/1084/1000/files/43990559568.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/49724175928.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4557/files/kotejevimonojotozewi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/edit_hosts_file.pdf
    • https://cdn.shopify.com/s/files/1/0434/6698/1542/files/gotagisevanilogegu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2736/5031/files/ejercicios_resueltos_de_centroides_y_centros_de_gravedad.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_off00006bfe.bin
b91633ec1dea04a98bd6e34d339cc65ccdc0797e57d6f22a06718d854689c0ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFE 5076 bytes
font_01_sfnt_off00007d08.bin
401b5d395b6debc660fe4a132b9293af5fb2ab112bed1b5d922102eb521b805c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D08 11892 bytes

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