Malicious PDF — malware analysis report

Static analysis result for SHA-256 9334c7f093e3fd21…

MALICIOUS

PDF

53.9 KB Created: 2020-08-11 03:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e63421f40fb662b37eef0445a6714df0 SHA-1: 63262ae4e6c8de446048af5cd2e86209eee7a147 SHA-256: 9334c7f093e3fd2141742454a22bbc62ce4e7b293255831e05d603ca94c6dde5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'definition of international accounting standards pdf' and the malicious URL. The primary malicious link, 'https://ttraff.cc/pify?keyword=definition+of+international+accounting+standards+pdf', is designed to redirect users to potentially harmful content. The presence of a large number of external PDF links also suggests a link farm or SEO manipulation tactic.

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=definition+of+international+accounting+standards+pdf
    • http://files.yizhixu.com/uploads/1/3/1/3/131398102/fisenizadak_redafex_mitutalojejid.pdf
    • http://files.mainetwpadultlearning.com/uploads/1/3/0/9/130968926/zumodafobu-narenozi-linega.pdf
    • http://zarevi.westhavenhoa.com/uploads/1/3/2/3/132302815/mazetir-bobikevuto-wepotite-pupamefi.pdf
    • http://files.seastarrock.com/uploads/1/3/2/7/132740204/nudupes.pdf
    • http://files.blessedimp.org/uploads/1/3/0/9/130968996/wimosife-bazotakexijixa-dedesanamop.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/gikutagepapifatusodovewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7824/5781/files/sojisanabivobajakuroda.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/convert_string_to_char_array_c.pdf
    • https://cdn.shopify.com/s/files/1/0437/9063/1064/files/99803414378.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2722/files/schistosomiasis_life_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/11360914083.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/solodokozovokamumigan.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/pulesazivu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/eleuthera_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/vagigodafozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1702/files/16217948319.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_off000093ad.bin
596dc81c068ffe1ed78858f0b9c395b2b3bc14000b8c30c518d45d7f54c359f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93AD 5320 bytes
font_01_sfnt_off0000a5d5.bin
1c2b422e95971d5ed218cf39f3db7df2bcad8391ab9565d11d15723efe38f229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D5 10544 bytes

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