Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fb7ffb58e7a6d5…

MALICIOUS

PDF

46.8 KB Created: 2020-09-03 09:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e492310d6e1668b337dbd387b6d9c5c SHA-1: 721af62728cee7d8583ff2b84773e2e2fb560889 SHA-256: 87fb7ffb58e7a6d5cb134eb7c18bd8b6f401f0254d231698b9d7ed661538e16e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'billiard aiming calculator pro'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external PDF links suggests a link farm or SEO poisoning attempt. No scripts were extracted, but the primary attack vector appears to be directing users to a malicious URL.

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.club/wix?keyword=billiard+aiming+calculator+pro
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_9e013ddffe1141b6ae4e7d874a777881.pdf
    • https://static.usrfiles.com/ugd/078c79_80c2b0507d164150906b1e9beb927fde.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_072a52637e0f4e9d81ca4817a3c51a99.pdf
    • https://static.usrfiles.com/ugd/affb4a_5f7064fbae3e46baa526e5afb8762283.pdf
    • https://static.usrfiles.com/ugd/4b7290_4ede78f5615844aa93e2d77faceafc96.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_7c18d384609749e8bdfa166448e2e5ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_69b3128544a7431b8e0a3489cbf698fc.pdf
    • https://static.usrfiles.com/ugd/8a419d_fb5bfe286b0f4f0e946a03972ee3f26c.pdf
    • https://static.usrfiles.com/ugd/05900a_ed46bc2120fe4b78bf15760858202b5e.pdf
    • https://static.usrfiles.com/ugd/34ec99_22b0e59dfa9b460bb82d55b8ab2e85aa.pdf
    • https://static.usrfiles.com/ugd/fd3290_7a2e29aed2f748e38256de441c6f2aca.pdf
    • https://static.usrfiles.com/ugd/2c8d66_be1f4732ce824c67acefed7a4ae0a9cd.pdf
    • https://static.usrfiles.com/ugd/e1c37d_f08b55045ae7489c80d163f73d6ddfd0.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061da.bin
de5ee0d79b6ce495e7935671a9dc340ebcece8591be282414fb998ab6f89a59b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DA 5028 bytes
font_01_sfnt_off000072ca.bin
fab162f7ec648a685231faec9265f1b314d5eb5612304e114f5338261216b2f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CA 14592 bytes
font_02_sfnt_off0000a085.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA085 4324 bytes

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