Malicious PDF — malware analysis report

Static analysis result for SHA-256 286a9fa61dc76caa…

MALICIOUS

PDF

46.8 KB Created: 2020-09-01 15:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c28016e696a17d3656bf79feb3d5cf75 SHA-1: 642129618f5802965dd442929ce486daa06ff5f8 SHA-256: 286a9fa61dc76caa7cb9722d02af4731edf004c19d94c61c4843103385d667a3
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=game+alchemy+classic+mod+apk'. This URL is presented within the document body, suggesting a social engineering lure for a game mod download. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. The ML classifier strongly supports the malicious verdict.

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=game+alchemy+classic+mod+apk
    • https://static.usrfiles.com/ugd/0c8cc8_9229f1d90d7b43caa06395a8bb6d9c02.pdf
    • https://static.usrfiles.com/ugd/b8c837_80ed5782f88e4ec5ba645ee0d45e12b7.pdf
    • https://static.usrfiles.com/ugd/ee4a13_c7d70e19e8e44e6bbefe852175a02c0e.pdf
    • https://static.usrfiles.com/ugd/c12414_3d8d7eeaaa174c1eae374b78f10e8178.pdf
    • https://static.usrfiles.com/ugd/de65f7_1f8d3430d7c045f2a9cb90a7a4aba782.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8951/files/led_zeppelin_houses_of_the_holy_tab_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/3208/3612/files/maplestory_2017_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/66542466696.pdf
    • https://cdn.shopify.com/s/files/1/0433/3787/5614/files/online_education_system_project_report.pdf
    • https://static.usrfiles.com/ugd/6cf392_26b76c06db1b47b583732f9ec50d6988.pdf
    • https://static.usrfiles.com/ugd/5de1df_b0784b66c06c40ec94e9fafdf29fa7a8.pdf
    • https://static.usrfiles.com/ugd/8b4172_e6ad08fbeca24e5f8206802d9aa185d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6714d82fa35f44c6a625d57ceb2ad1df.pdf
    • https://static.usrfiles.com/ugd/80c1db_c0ff0d38c5e9494dbefba0c790c1fbf6.pdf
    • https://static.usrfiles.com/ugd/fb5067_896e181cbffd47d08ff9c14471d8c2d7.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_8ef1136b8ca74c9cb8173f8c3a74dd4a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006490.bin
72c6140b45111caa7ed1f201d1db7c62cc075523ac0d07f46a9d0b62f296a866
pdf-font-stream PDF embedded font (sfnt) at offset 0x6490 5416 bytes
font_01_sfnt_off000076df.bin
cda02968feb00ba4756809c4264f67170257870997dc144a7414be32f70c2cba
pdf-font-stream PDF embedded font (sfnt) at offset 0x76DF 9980 bytes
font_02_sfnt_off0000994a.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e
pdf-font-stream PDF embedded font (sfnt) at offset 0x994A 16092 bytes