Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41e2555b7ae07d9…

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 22:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b85f2c2aea23c6e76403b120d0186a09 SHA-1: 29621274fe13e54019e49d311c6e6bb103e9f341 SHA-256: f41e2555b7ae07d9ee79e6c6a094f0a2a9e2b5b05cc18e2baf6ebf4604c0faec
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to a known malicious redirector, ttraff.ru, which is likely used to funnel users to malicious sites. The document body, though heavily obfuscated, contains a reference to the same malicious URL, reinforcing the malicious intent. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=cannondale+lefty+service+manual
    • https://static.usrfiles.com/ugd/eed56f_ccd1a3ada881474ea1ce34769f352867.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_0d4b0a8f570a4be7943d5124249c46ca.pdf
    • https://static.usrfiles.com/ugd/913720_c213ad419b8b4e389b92b36a6cc518bb.pdf
    • https://static.usrfiles.com/ugd/e5a943_197441899a964a58afdc049ab3f24826.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_dbb384c571714b4cbfb25bb6b526768e.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/govuwejujuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3282/files/xuguxugafukoponapejil.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/gelujadepidavosif.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/infective_endocarditis_guidelines_2015.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/88864150559.pdf
    • https://static.usrfiles.com/ugd/314c35_fe47585580b1406a8478876182f1d3b2.pdf
    • https://static.usrfiles.com/ugd/ae15ca_46a585531e984c94aff821e13503ac7d.pdf
    • https://static.usrfiles.com/ugd/837d34_0d4f3bf9811644c2b757ccc7e9ebd78e.pdf
    • https://static.usrfiles.com/ugd/837d34_c218ff178e3d404cb31f39295d4f7d61.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_off00006bca.bin
268875490e3885a27f805e9e6068c662c1b61d9a25152d06e08eb0d981ee48e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCA 5232 bytes
font_01_sfnt_off00007d92.bin
b79eee560f423f2642aa584845ad5bf435b76063caa2c129ed5fef306ffbeeb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D92 11084 bytes

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