Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdb793c3ef987ea…

MALICIOUS

PDF

49.8 KB Created: 2020-08-30 05:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39807a70b369fad4b89b71831ef7698d SHA-1: e53c0658dadbb8bbddf4b925bfc3349458d1043e SHA-256: 5fdb793c3ef987eae033ab58e6778600129132b9cc6919d5a4ad6c540cdcc9b5
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains references to '2005 honda civic service manual' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious redirector URL and the nature of the PDF content suggest an attempt to lead the user to a malicious site, likely for phishing or further payload delivery.

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=2005+honda+civic+service+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b0b521_04d7aade381148cca9a0f076611c82dd.pdf
    • https://static.usrfiles.com/ugd/0047a4_5c84cf6fd17e4a75b9efc7d505ad1401.pdf
    • https://static.usrfiles.com/ugd/1f2646_2d8e2cf824494bccbfdb813df80dac98.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f43db93141a4c9eb6654141442679df.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b19eccdfcb944e6a3c3342d73ce3356.pdf
    • https://static.usrfiles.com/ugd/b8c837_e43635ec5705449cb025bf6588570ddf.pdf
    • https://static.usrfiles.com/ugd/ed64d2_d912acebc54c4c71b27452c89fa6b968.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8372/files/kumepesik.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/25588843738.pdf
    • https://cdn.shopify.com/s/files/1/0430/7153/7301/files/zafugutepajisowav.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/14757470730.pdf
    • https://static.usrfiles.com/ugd/c618e9_4fa17e96a2514266b05701e052ef0262.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad2a0f22c7be40129c68c2f642b7d6ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceb7b271360e488e863b26e28043d87c.pdf
    • https://static.usrfiles.com/ugd/b910ae_0c0b2ee46178444da6d5767740c02e73.pdf
    • https://static.usrfiles.com/ugd/3f80ec_e4af0522f2c64d3ea9863b0ba59a8926.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_off00007647.bin
091807e5c4f3b07e393d1591aaa6dfcfb301770413f41d81957646a8a944387e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 5344 bytes
font_01_sfnt_off0000882e.bin
5dc0b4bde37f388d1fd00962de0cffeb5cf04be86c187dfff1b6aaa18725692a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882E 10508 bytes
font_02_sfnt_off0000abb1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABB1 4324 bytes

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