Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c07f74b98856ec3…

MALICIOUS

PDF

42.0 KB Created: 2020-08-18 22:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5fca4ddffafedb98c42350501b0eb44 SHA-1: a09d1fd2b910d4b176008d2fa0c76bab7def3b72 SHA-256: 4c07f74b98856ec3b6562fa2e7bffd5c7502c0e41fc7fe6d59ef8c19555fa1d8
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'real chess game apk' download, which points to `https://ttraff.cc/pify?keyword=real+chess+game++apk`. This link is part of a link farm designed to attract search engine traffic. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL and references to wkhtmltopdf, indicating it was likely generated programmatically.

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/pify?keyword=real+chess+game++apk
    • http://files.fittingroomligonier.com/uploads/1/3/0/8/130814672/sodumavasoso_sugenufefigu_tinivotosuna_sezomojodupebe.pdf
    • http://files.natomasschoolofmusic.com/uploads/1/3/2/7/132740327/tawapononapedej.pdf
    • http://files.craftybrown.com/uploads/1/3/1/6/131636589/f7e46af7ff7b.pdf
    • http://dofesukek.thefountainsathosanna.com/uploads/1/3/1/4/131406430/vofivibo.pdf
    • http://files.itslikemusictomymouth.com/uploads/1/3/1/3/131380008/gogafurer-pujata.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/1341631147.pdf
    • https://cdn.shopify.com/s/files/1/0437/1903/2987/files/54128988625.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/vumijumebefofegek.pdf
    • https://cdn.shopify.com/s/files/1/0435/3851/4071/files/starcraft_2_counters.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/interview_questions_and_answers_for_networking.pdf
    • https://cdn.shopify.com/s/files/1/0443/0381/0716/files/ashrae_handbook_of_fundamentals_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0434/1016/1829/files/pimuvosefoxowiz.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/zofiwodofisosukevapalo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2548/files/lesuror.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/34635675371.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_off00005be3.bin
b2eb6814e31dba478d805fc5685494bb0d481bc3ea61392af637534d91435e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE3 4764 bytes
font_01_sfnt_off00006c12.bin
74496e36b49bcfd181ad6b2f348d82df7f90253624334f549ce2119d2d5d3f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C12 9724 bytes
font_02_sfnt_off00008d00.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D00 4324 bytes

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