Malicious PDF — malware analysis report

Static analysis result for SHA-256 79830fa04ac585f1…

MALICIOUS

PDF

63.6 KB Created: 2020-08-10 20:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c12addec444039502224818f8c5194a2 SHA-1: a90a75fc4cfe4afa5fc401b7838801bd43cb71e2 SHA-256: 79830fa04ac585f17436dde88d8acf5bba839a3220e500736dc3546982f6ce83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged as malicious by an ML classifier and contains a significant number of external links, many pointing to a redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=stable+and+unstable+angina+pdf, which is likely used to distribute further malicious content. The presence of numerous links suggests an attempt to create a link farm for SEO manipulation or to distribute malware through various channels.

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.ru/pify?keyword=stable+and+unstable+angina+pdf
    • http://tijixul.kerrycaffynart.com/uploads/1/3/1/4/131408024/xunemebuz-xaxitelaponap-vivedokafenilip-xirad.pdf
    • http://jilevoli.namtokkitchen.com/uploads/1/3/1/4/131438759/4372285.pdf
    • http://files.sanmateolimos.com/uploads/1/3/1/3/131383553/612544a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/35063446312.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/5864197611.pdf
    • https://cdn.shopify.com/s/files/1/0436/4196/2646/files/gonutuzasomuvijijivivok.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/nonuge.pdf
    • https://cdn.shopify.com/s/files/1/0450/1933/2766/files/calendario_aprile_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/9735863310.pdf
    • https://cdn.shopify.com/s/files/1/0440/5320/1046/files/20279079675.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/xivapek.pdf
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/taxidivofufonasosara.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4884/files/meaning_of_language_acquisition.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1853/files/automated_dna_sequencing.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/92278638631.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_off0000b9b6.bin
d1ce77eb898a1563dbc836e5970484a5a333f53af48f0267cbbd65f36b1f35ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B6 5356 bytes
font_01_sfnt_off0000cbf7.bin
65e28327ab2ece25a10b54de299ea3e483f28a1bf7f71adfa3d4288b226f75c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 10968 bytes

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