Malicious PDF — malware analysis report

Static analysis result for SHA-256 5327bc8f4f9af450…

MALICIOUS

PDF

42.5 KB Created: 2020-09-06 17:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e4c30f505d1e0a41d5ec4d6c9e479b SHA-1: 8f8444f1fcdf0dc890d1b6932befa6f35af4b034 SHA-256: 5327bc8f4f9af45060b62eb461040dd7c84b8fd9255fb5c9f49c6acf09f7f13b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=ball+valve+autocad+drawing'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a lure to a malicious site.

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.me/wix?keyword=ball+valve+autocad+drawing
    • https://static.usrfiles.com/ugd/3ce946_63e769a8085d487faa89b8f1f317521a.pdf
    • https://static.usrfiles.com/ugd/ab922d_cfdc18e4d69241fb8d590295ca7f0e32.pdf
    • https://static.usrfiles.com/ugd/cc1a03_c5f60ebd2f2747cbab5edcab1546db0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_362ce055998348668a5072dc3eb203d9.pdf
    • https://static.usrfiles.com/ugd/f84671_0791e5c76051475bbc403bd217cc0bd8.pdf
    • https://cdn.shopify.com/s/files/1/0436/0978/4482/files/22514918766.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/puzosesuniligewi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3935/7093/files/bahubali_1_cinema_songs_naa_songs.pdf
    • https://static.usrfiles.com/ugd/7ff653_9aae6193133344a88aa5ae46c627adc9.pdf
    • https://static.usrfiles.com/ugd/83f04e_135dbe2695584eb58680342055bcba39.pdf
    • https://static.usrfiles.com/ugd/c0fca2_933f5c22fa954e2d83f0922b6d8541f2.pdf
    • https://static.usrfiles.com/ugd/d55797_8c21a3567b1e4043b1d15eb1bb964da4.pdf
    • https://static.usrfiles.com/ugd/49488e_4db71ded95804b84ae2f4203b9d122d1.pdf
    • https://static.usrfiles.com/ugd/89c6ad_38c3b85f4f144ecabcc7d99356ac5cfa.pdf
    • https://static.usrfiles.com/ugd/837d34_5fe9c08ea560411d9d44b85b6a8156fa.pdf
    • https://static.usrfiles.com/ugd/2f7815_bd24e303c12b4b018bee8434ff8db37d.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/
    • https://static.usrfiles.com/ugd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006137.bin
9fdf6f892153fec132863b06d4c0cb4fc3772649d4e4851d0e416344a131e840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6137 5132 bytes
font_01_sfnt_off000072d1.bin
ce0bd25850fe6005a74694d0f2f8c5370e41b9cf4fbd96190f965835add2d4ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D1 13296 bytes

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