Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81acad429f9d261…

MALICIOUS

PDF

50.8 KB Created: 2020-08-05 18:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b88b57d74be39d137923ba172deb0fba SHA-1: 70ae87bfcaa49c47c1eda3c305e8d1889692e1e5 SHA-256: a81acad429f9d26160a948e0fb42dea9c01eda999b1f2d04013289d46fbf9e25
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.cc/pify?keyword=supply+chain+network+design+pdf, which is presented as a document download. The document body itself is heavily obfuscated but contains references to the malicious URL and numerous other benign-looking PDF links hosted on Shopify, likely to improve search engine ranking and disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=supply+chain+network+design+pdf
    • http://files.kellypenmanrealestate.com/uploads/1/3/1/1/131164424/8466718.pdf
    • http://files.photography-timeless.com/uploads/1/3/1/8/131871745/pasego.pdf
    • http://files.doghouseprojects.ca/uploads/1/3/2/8/132815298/8280487.pdf
    • http://files.ennisexterminating.com/uploads/1/3/1/0/131070374/gozusoletajatijimo.pdf
    • http://files.meganfmccormick.com/uploads/1/3/0/7/130775668/dazikenul-muviziti-nideg-xedugusevuji.pdf
    • https://cdn.shopify.com/s/files/1/0434/2425/2055/files/attestation_de_salaires_dclars_cnss_tunisie.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/opportunities_beginner_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/notazud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/sisasasesikuleruwaludi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1189/files/45196706998.pdf
    • https://cdn.shopify.com/s/files/1/0438/7710/5832/files/wexideligazufivapozojel.pdf
    • https://cdn.shopify.com/s/files/1/0435/1324/9944/files/list_of_common_countable_nouns.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/zatepeteximogod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1174/3639/files/nasaluwow.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/waterfall_model_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3356/files/come_together_chords.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/61582858855.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_off0000791a.bin
5ad1193c381d3f0244a5a96d3b5fbe229c8003de09a6e1a6d790dbf5cd3a2bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791A 5660 bytes
font_01_sfnt_off00008c65.bin
dfe1d7e83a916d6beb043f0ae25c2338d7a54bc94df1fd0ddc1899354c4f347a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C65 10456 bytes
font_02_sfnt_off0000b00c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 4324 bytes

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