Malicious PDF — malware analysis report

Static analysis result for SHA-256 d677dec8799d61ad…

MALICIOUS

PDF

43.6 KB Created: 2020-09-01 07:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d09b179e47e13197967cfd03b2540b4b SHA-1: 585a879abc9f657f16161ffe05a836f7243e666d SHA-256: d677dec8799d61ada641956853612cd8f069ff3dcc70989a9612e08314f23908
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination. The document body, though heavily obfuscated, contains text related to 'Asphalt 8 airborne mod game' and the malicious URL, suggesting a lure to download or access malicious content. The PDF also contains a mass of external links, many pointing to static.usrfiles.com, which is flagged as a link farm.

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.cc/wix?keyword=asphalt+8+airborne+mod+game
    • https://static.usrfiles.com/ugd/4d6844_e953953e1b8842b39d724f1d563a9284.pdf
    • https://static.usrfiles.com/ugd/538d67_c3fea35e72ac4fda940da48032d78c23.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e6e44d4e4bf4eafb1fee7e3daa17d38.pdf
    • https://static.usrfiles.com/ugd/93971e_86749c79dbe84c9ba6ae4052b5356ea6.pdf
    • https://static.usrfiles.com/ugd/b8c837_50ee4684e01842bd83f915bbc222b7f4.pdf
    • https://static.usrfiles.com/ugd/756799_02a9047ff88241b88f73999db3f7fdec.pdf
    • https://static.usrfiles.com/ugd/270e53_104788f4e8d141c8a3738c904b719932.pdf
    • https://static.usrfiles.com/ugd/f0f215_d1970be1514a4903beaa50387aa32d82.pdf
    • https://static.usrfiles.com/ugd/b8c837_4891e5af8b2848b594073f2fefbcc7f1.pdf
    • https://static.usrfiles.com/ugd/921909_edd9b0624ed84e948023c482299f9f66.pdf
    • https://static.usrfiles.com/ugd/b8c837_20112825a67444488be804422d35c2d6.pdf
    • https://static.usrfiles.com/ugd/bfbc46_a431c986c9df4b469cb2b941a1857832.pdf
    • https://static.usrfiles.com/ugd/271e65_d067be4b74da48449b4d42f50f67f09c.pdf
    • https://static.usrfiles.com/ugd/b8c837_09b453a9940544f2b6c67044e154fa97.pdf
    • https://static.usrfiles.com/ugd/76de1a_c812c8dcc3cc49a19c69dfb167a83a7b.pdf
    • https://static.usrfiles.com/ugd/902d29_00fc9b7f848f493a8de2ba9e9822da48.pdf
    • https://static.usrfiles.com/ugd/b5aed9_c2d0cada48ab49f68417ed2f7f6f5e93.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_off00006d50.bin
ee7d6929d6cc3ccb4378f9a3b157c7bc24e34f6aae63bcbc305e080a502f4d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D50 5696 bytes
font_01_sfnt_off00008074.bin
2bc389070b06e6ac0735642eabbc97eef343d6d1afff631d9d8ac880d7fbd7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8074 9784 bytes

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