Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72f7c6e0e599b7a…

MALICIOUS

PDF

43.2 KB Created: 2020-08-15 04:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f241e5708a3979f27d5537a44ddfbab9 SHA-1: 61d83757cb45bb087d32c56084d8b74cbbdd890a SHA-256: f72f7c6e0e599b7a7a899fd65d6237eadceec0635c165c55e7e548df22a0408e
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, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'learning french audio lessons free' and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to 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.com/pify?keyword=learning+french+audio+lessons+free
    • http://files.sewprettystudio.com/uploads/1/3/0/8/130874224/2068078.pdf
    • http://files.orlandokb1.com/uploads/1/3/0/7/130739510/9787087.pdf
    • https://cdn.shopify.com/s/files/1/0429/1277/6351/files/wirokezozuxomu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3556/4949/files/48318829580.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/13652478478.pdf
    • https://cdn.shopify.com/s/files/1/0429/9309/0714/files/41617056230.pdf
    • https://cdn.shopify.com/s/files/1/0434/0865/4492/files/48300430814.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/23509485571.pdf
    • https://cdn.shopify.com/s/files/1/0436/3426/2169/files/42888727532.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5388/files/2d_array_c.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_off00006c4c.bin
5e25aca23dde247d841684632ecea54eba051ce9b2f4e6ab3900438b397f42ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 5224 bytes
font_01_sfnt_off00007e09.bin
254eb994d8386874809352df1637959f5dff63779ff8b66fff995c48e2bbc5ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E09 10044 bytes

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