Malicious PDF — malware analysis report

Static analysis result for SHA-256 619b2544e447ddc7…

MALICIOUS

PDF

44.6 KB Created: 2020-08-08 16:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4749a672125949b8ebe901327362b965 SHA-1: 77289e01ea0da7639677cf4f85609e118bcd7565 SHA-256: 619b2544e447ddc7f48cbaa2c764041e0e783adb19f5b3050e9435d8360cae7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised with a keyword related to 'adrenal fatigue'. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, indicating a high probability 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.ru/pify?keyword=adrenal+fatigue+21st+century+stress+syndrome+pdf
    • http://files.tetiana.net/uploads/1/3/2/6/132682790/0e55e0e9c.pdf
    • http://files.michaelbrownslawoffice.com/uploads/1/3/1/4/131406762/xajixolaxexojobegu.pdf
    • http://files.ssmercy.org/uploads/1/3/2/8/132814958/2a51c09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/autocad_tutorial_in_amharic.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/japowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23631451812.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4452/files/vejigimu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1048/files/fedapesumatoloje.pdf
    • https://cdn.shopify.com/s/files/1/0428/2646/5436/files/gemafisupotonepalogisizus.pdf
    • https://cdn.shopify.com/s/files/1/0439/0073/1547/files/lalof.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/mugetufuzepixisomedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/13454665031.pdf
    • https://cdn.shopify.com/s/files/1/0432/4301/2256/files/boyne_mountain_trail_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/historia_de_la_ortopedia_dental.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/what_is_street_address_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/crown_him_majesty_chords.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/89894467124.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_off00006d00.bin
c45b3e19abe66f7211eb730e9906f6b4ce5ac7aba6131ad9d81e34a623e46eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D00 5748 bytes
font_01_sfnt_off00008097.bin
6391a7bcae37108b27b7cd64fd038ab48842736ff0cdca1d8a2fcad116f99cd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8097 10756 bytes

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