Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d0aaaee293bf77…

MALICIOUS

PDF

55.5 KB Created: 2020-08-30 06:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc933777a1643d866bb04362d46b1d79 SHA-1: b3b8b76356f10d4a025abc7a457f9b43a813d2d6 SHA-256: c3d0aaaee293bf779cdd83a29f1eca1860b3f2c995d557c5e1192c2290c4c221
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its extensive use of external links, forming a link farm. One of the primary links, 'https://ttraff.ru/wix?keyword=3rd+grade+math+spiral+review', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains this URL and other links, suggesting a lure to external, potentially harmful, content. The ML classifier strongly supported 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/wix?keyword=3rd+grade+math+spiral+review
    • https://static.usrfiles.com/ugd/b8c837_e56ee6fdb47b4ebaafe091e3d54d311d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba2eaa1b68bf47669681f49f3c753994.pdf
    • https://static.usrfiles.com/ugd/3f80ec_dc420b98ba0846b39a25e46e833b272c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6718665c2c244bb0a2cd4bbcf9101354.pdf
    • https://static.usrfiles.com/ugd/b8c837_7965b7021d734b74bcf01906dc02aa5d.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/48921614146.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/public_health_nutrition_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/7516/6620/files/57590062677.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/lixisafatisenu.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7cc99874ed64601ab3f186fd024d79d.pdf
    • https://static.usrfiles.com/ugd/3b0c81_3771168475f94e8ca597c266dc2739ab.pdf
    • https://static.usrfiles.com/ugd/451461_08a58d7e47134d6695fc9539969ce29c.pdf
    • https://static.usrfiles.com/ugd/e5a943_15489b37371c43348d7ef202859f093a.pdf
    • https://static.usrfiles.com/ugd/06497e_159e8037388b47358f9e40435acc494f.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007796.bin
79182ddd2402226bf4f3225af20055046fe9eefad8048c29c17ec2e8a695db98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7796 5164 bytes
font_01_sfnt_off00008927.bin
8a2ef2d193c5bc2f90fa18e71fb928aaeb2d8f0253a8ce300789b3d820f6a308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8927 10272 bytes
font_02_sfnt_off0000ac7b.bin
8bbf90460d3f148c47164d2a84add8b4dd14f46b8b20d98d1d02f2c14119a38f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7B 16312 bytes
font_03_sfnt_off0000c22c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC22C 4324 bytes

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