Malicious PDF — malware analysis report

Static analysis result for SHA-256 1241c5e957603525…

MALICIOUS

PDF

41.7 KB Created: 2020-08-15 14:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f2ac73503a35f4af666338b9917521f SHA-1: 3f755347a0c5968938521e3d709750b829257d4e SHA-256: 1241c5e95760352554ed5008882b16f8547e20034c95a68dabc1265d5c433064
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous links, including a malicious redirector, points towards a phishing or malicious redirection attack.

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=sensors+actuators+and+their+interfaces+pdf
    • http://wikoxew.deannabaldi.com/uploads/1/3/0/8/130813055/ziwikimanumeg_lokotederediw.pdf
    • http://files.glenroypreschoolcentre.com/uploads/1/3/1/8/131856917/4000c5b56.pdf
    • http://files.kingrobinsonibmagnetschool.org/uploads/1/3/0/8/130874063/letumiraxarizusu.pdf
    • http://files.deniserodgersbooks.com/uploads/1/3/1/3/131398100/tixutubaluzo.pdf
    • http://files.photographybycarrie.co.uk/uploads/1/3/1/6/131636651/7477664.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1062/8511/files/10798408162.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/44889365812.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/pivalonamitapiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/21087434616.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/widasuzozutimedote.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3381/files/wajijovuwixekazutotujevof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.pdf
    • https://cdn.shopify.com/s/files/1/0437/0389/4171/files/nukusegexipase.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_off00005eb0.bin
464ea6f646cb9e3378b2cb524021c4b440a4757731a23587e5d98d1d47cc1f5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB0 5316 bytes
font_01_sfnt_off000070b3.bin
4568d5c2655d5436e7587674d8c98e94dd20352a02f4cde15005d3b70056dd0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B3 12960 bytes