Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd8755c55d5fcac…

MALICIOUS

PDF

44.2 KB Created: 2020-08-08 10:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 670f1015f96d05f785f477ffd604cf39 SHA-1: 3af6c085bfdac786d06e9d7b9469cc8ca0d502af SHA-256: 0fd8755c55d5fcacfd89d0d576ac35c3df2aab00d46e4de8e0edfec6f4056ae3
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://ttraff.ru/pify?keyword=callan+method+pdf+stage+7, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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=callan+method+pdf+stage+7
    • http://files.spinningroadbaptist.org/uploads/1/3/0/8/130874612/mepufonagexi_dixapiroguxel_kuxuz_kebulubo.pdf
    • http://files.landscapemodeling.net/uploads/1/3/2/6/132696214/863d99d32.pdf
    • http://files.beatrice77livestocksales.com/uploads/1/3/1/4/131407035/sudapiwalera-papufuwika-timuzag-xuwujez.pdf
    • http://files.onceuponabus.com/uploads/1/3/1/0/131069860/kufuwibabomak.pdf
    • http://files.jarettfajardo.com/uploads/1/3/1/4/131407918/2125320.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4189/0209/files/notewifutuzudiba.pdf
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/pdf_and_cdf_of_random_variable.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/nurimesibomarebabukarovij.pdf
    • https://cdn.shopify.com/s/files/1/0434/4230/7239/files/62052812532.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/93815882307.pdf
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/zuxotirudemuvatabarelez.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4412/files/nursing_care_plan_for_depression.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5495/files/cagliari_mappa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6938/files/zavosafelezagesijixum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/75859956709.pdf
    • https://cdn.shopify.com/s/files/1/0439/0813/7128/files/advanced_ms_excel_course_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0103/files/tosadosadesibadut.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_off000067c5.bin
dfd9d98903fdea6106fc2a2686539b60a932ef2b3ad02dddeaf438a6c4eb5804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C5 5344 bytes
font_01_sfnt_off000079d7.bin
f00f119787304984ae06bd25733cd504bec3745c12a375a8adca0f6fa8387edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D7 12724 bytes

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