Malicious PDF — malware analysis report

Static analysis result for SHA-256 364d2c86f082dfb7…

MALICIOUS

PDF

40.1 KB Created: 2020-08-08 22:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23fd59d9fa115651d21c7a31edbbd233 SHA-1: 042bf9511b39b85620200db2fa94f822800a746e SHA-256: 364d2c86f082dfb72a12fbeaf3826e788fea581697658635348657c3e6e4b425
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: Malicious File

The PDF contains numerous embedded links, with one pointing to a known malicious redirector (ttraff.ru). The document body, though partially corrupted, contains text related to 'ctet 2020 full syllabus pdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm and a malicious redirector indicates a phishing or malware distribution attempt.

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=ctet+2020+full+syllabus+pdf
    • http://jomem.bjmatthewshomerepair.com/uploads/1/3/1/6/131637814/rodise-saliz-tofege.pdf
    • http://lakes.greatlakesantiquesandartisans.com/uploads/1/3/1/4/131407089/8237373652a7bdb.pdf
    • http://files.lipsticklegion.com/uploads/1/3/1/4/131437683/d9591.pdf
    • https://cdn.shopify.com/s/files/1/0435/0623/7604/files/alessandro_scarlatti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/7483585117.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/british_council_ielts_reading_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/0945/7825/files/surusimegine.pdf
    • https://cdn.shopify.com/s/files/1/0434/6177/1430/files/65330188565.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/33796617729.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/61150325945.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/95737428936.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/67735152484.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/timoforumivosipimuposonop.pdf
    • https://cdn.shopify.com/s/files/1/0439/2511/0952/files/certificate_of_participation_template.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_off00005e47.bin
1d27c3d0836cf3448065466013f2754941c5de2b48366888c40b5028831eee1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E47 5360 bytes
font_01_sfnt_off00007093.bin
cc92a82dcc3dbd052250bcbe4dc9f4074b5933e2d144146669ec2d62a0bc0d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7093 10328 bytes

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