Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5504e204880283…

MALICIOUS

PDF

40.0 KB Created: 2020-08-11 00:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf3e2e7c1e9b210f98de857d5c2ecafd SHA-1: 7252c79cb3d5d5bbf246e7104d20e51244d25995 SHA-256: 3c5504e204880283c5bae143f0e844dc0eae9b117ad5c1b7cd641ea033ab9d7b
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.cc'. Another critical heuristic indicates a large link farm hosted on Shopify, suggesting an attempt at SEO poisoning or distributing malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=aristoteles+pdf+filosofia
    • http://tuviralu.royalnavycemeteryantiguaproject.com/uploads/1/3/1/6/131606636/5212682.pdf
    • http://files.redcarpetbooths.com/uploads/1/3/1/3/131381946/d925d9.pdf
    • http://files.nachnook.com/uploads/1/3/0/8/130873826/1177640.pdf
    • http://files.siblingharmony.com/uploads/1/3/1/4/131407692/7cf3e91a9885d5c.pdf
    • https://cdn.shopify.com/s/files/1/0437/1592/0024/files/punusegowuroniru.pdf
    • https://cdn.shopify.com/s/files/1/0431/3582/8124/files/savuzakiforajar.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/3._5_stronghold_builder_s_guidebook.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/wiwubexazaburakudedosu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7869/7631/files/ariens_snowblower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1131/7658/files/30947135671.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/womogujegiketudewo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7025/7320/files/11502325897.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/62605784997.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5609/files/surabaxumugomuvoxop.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/jujiponininigijomenusedi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/26056731548.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8854/files/49356318201.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/43840374452.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/96751397224.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_off00005fff.bin
f39a36d8ca03868836273252d02b3961b5d37fb955b0d3a66fe9ad26bdbbb00b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFF 5024 bytes
font_01_sfnt_off0000711c.bin
b082dcb4d862ad4b95db9693f76b04f2f12b7b7d1b9b8c6f7d0bf93d611eff9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711C 9908 bytes

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