Malicious PDF — malware analysis report

Static analysis result for SHA-256 255efc04121b8457…

MALICIOUS

PDF

46.5 KB Created: 2020-08-18 23:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 840ce22b5cf6828a670f365ee0e951a9 SHA-1: db45cec2fb8115aaadd8ae0ebdda61f1e7a9e590 SHA-256: 255efc04121b8457c2884dde0001a0e1126634a466628e3ba4901d5be503b0de
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The document body, though heavily obfuscated, contains text related to 'multiplying fractions worksheets pdf 6th grade' and a URL that matches the redirector link. This suggests a tactic to disguise malicious redirection as educational content, likely for SEO manipulation or to lead users to a phishing or malware download site. The primary IOC is the redirector URL.

Heuristics 3

  • 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.
  • 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=multiplying+fractions+worksheets+pdf+6th+grade
    • http://vujikewif.elawrencecpt.com/uploads/1/3/1/3/131378776/fumixalagugifo.pdf
    • http://files.glitteratibath.com/uploads/1/3/0/8/130873880/178e5573a85.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/xadorevalizinuw.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0021/files/xodidopubutanugapebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24810932871.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9645/files/seeing_is_believing_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/vututomarar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20807514836.pdf
    • https://cdn.shopify.com/s/files/1/0429/1595/4847/files/pukerudexol.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/86490146382.pdf
    • https://cdn.shopify.com/s/files/1/0431/6545/0389/files/macbook_pro_2011_gpu.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_off0000773d.bin
ad5f81275b1660af153bd057ce6a5ac88f877edb2816fb5a1b68a5d69bb36675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773D 5836 bytes
font_01_sfnt_off00008b2b.bin
befb7429d236a82ebed2a2060e8358f9fcd7b6601d713ba9ba3f8ada0f053287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2B 9892 bytes

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