Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfbd380b42f9839…

MALICIOUS

PDF

43.8 KB Created: 2020-08-06 06:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef877077d7ad4f2f3882c0ef98f8d2b9 SHA-1: f8e22abba885557cf0341203bb6d2f2ba3b2d675 SHA-256: cbfbd380b42f9839634f9e84311972940428314a72bc0ea5390803c6ab5e80eb
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=entrepreneurship+development+pdf'. It also contains a PDF link farm heuristic, with many links pointing to Shopify domains, one of which is 'https://cdn.shopify.com/s/files/1/0435/5863/3631/files/xuteli.pdf'. The ML classifier strongly indicates maliciousness. The document body contains the malicious URL, suggesting a lure to trick users into clicking it.

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=entrepreneurship+development+pdf
    • http://files.pestcontrolfortworth.net/uploads/1/3/1/3/131398036/xuvomaxok.pdf
    • http://files.phoenjitsu.com/uploads/1/3/1/4/131483343/xowewopefewinaxan.pdf
    • http://files.jewelrybyjimpluhar.com/uploads/1/3/0/7/130776449/nagiberafedew_bunezo_sesemuxuderu_foribibaruge.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/xuteli.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/paris_is_a_moveable_feast.pdf
    • https://cdn.shopify.com/s/files/1/0439/8402/7806/files/95149889910.pdf
    • https://cdn.shopify.com/s/files/1/0445/3344/8868/files/aims_and_objectives_of_dissolution_of_partnership_firm.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/air_brake_system_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/magidavomowomevofarofabob.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/p90_simple_kitchen.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/xuvova.pdf
    • https://cdn.shopify.com/s/files/1/0440/5306/9974/files/mario_party_7_iso.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6234/files/gebizomab.pdf
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/bivitexedojutobimew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/69346036409.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/icecream_reader.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/
    • https://cdn.shopify.com/s/files/1/0440/5306/9974/files/mario_pa

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f06.bin
3ff6885598a407b339b24576e5a18d298bf7ee0f77e9ae565a8f051ed11820b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F06 5088 bytes
font_01_sfnt_off00008036.bin
d4aad01ac6adc87fe16c2d97acd56e384794ea31b818f65d89a2c21842fb3b37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8036 9916 bytes

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