Malicious PDF — malware analysis report

Static analysis result for SHA-256 574b50a1e38d6a8b…

MALICIOUS

PDF

37.6 KB Created: 2020-08-19 19:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1386640050ebe51a71404cd45143bba SHA-1: 2d60c34fca52ee2953fef1955da4e49a7bc27dd7 SHA-256: 574b50a1e38d6a8be63a3ba6cd40a0938d6755dcf4b4abb00a182c7e87dcd6bc
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=candied+ginger+calories+nutrition+information', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to potentially harmful content under the guise of nutritional information. The ML classifier strongly supports the malicious nature of this PDF.

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=candied+ginger+calories+nutrition+information
    • http://tijiw.johnquah.com/uploads/1/3/0/9/130969742/rulonixubelarol-fojufato.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/62373440466.pdf
    • https://cdn.shopify.com/s/files/1/0447/5689/3847/files/41393294310.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/wotlk_leveling_guide_horde.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/arcmap_10._2_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/fallout_3_radio.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5010/files/analytical_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/2523/6121/files/zoverekobotowotuwibevak.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/66815071183.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_off000055ee.bin
80a70841e0bfafd19d507a98f1ab93c7dd08cd306867135c6379d0f2ca2182c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55EE 5248 bytes
font_01_sfnt_off000067ae.bin
e34121fe333d46f58177cf7c99dbf0fef9aed5887008db9ee773eacf0dd4b4a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AE 10080 bytes

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