Malicious PDF — malware analysis report

Static analysis result for SHA-256 86668ee9cf90a398…

MALICIOUS

PDF

41.0 KB Created: 2020-08-11 21:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 586b0d3b9143664552029712c33693bc SHA-1: dfa3e6e0bea4f8c94f70e96ca658551e098d288f SHA-256: 86668ee9cf90a398c514668ffabf216981521e0dd4a49c78a4cafe21e788c57e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious content. One prominent URL, 'https://ttraff.com/pify?keyword=amazing+grace+notes+for+piano+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.com/pify?keyword=amazing+grace+notes+for+piano+pdf
    • http://debad.annarbortreeservice.net/uploads/1/3/1/6/131606490/nikitepifemu.pdf
    • http://mepiwuxul.rockheightsvacationrental.com/uploads/1/3/1/0/131071243/nanebixexagus.pdf
    • http://files.sarahamacker.com/uploads/1/3/1/1/131163667/kijiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5167/9898/files/eclipse_mp3_player_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/509208247.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/rirefadepuxuxovulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/61650208908.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1402/files/25623913636.pdf
    • https://cdn.shopify.com/s/files/1/0432/3436/1508/files/brand_positioning_process.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/vobopetonaminetux.pdf
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/joxedeviwunokuniguze.pdf
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/principles_of_grammar_translation_method.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6777/files/codigo_de_los_caballeros_templarios.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/ruganeturumaxapubi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/99160572293.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/66159776113.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/rovufurezujidepopewozodu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f1.bin
04b39dbef4f1370786bb97b12e32ef5a254741de3d3c1e86f553c239c0fca6aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F1 5484 bytes
font_01_sfnt_off0000757a.bin
4b84e77dbcdb581650a71fabfb05d06f59535e9bc516a7414ba40dd5ea4a75a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757A 9980 bytes

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