Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1020149e10e666b…

MALICIOUS

PDF

37.2 KB Created: 2020-08-21 16:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e88ee09c2f4e05088fa901b406f652a1 SHA-1: 319cee5c5701a7f347c06a5cd0c7b5128c8f6493 SHA-256: b1020149e10e666b90408090161d0b09159dbcaca47c5d40f4d01c2fe0ceb683
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=create+pdf417+barcode+in+c%2523'. It also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same redirector URL. The primary attack pattern involves luring the user to click on the malicious link, likely leading to further compromise.

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.com/pify?keyword=create+pdf417+barcode+in+c%2523
    • http://jofoj.thespiritbutterfly.com/uploads/1/3/2/7/132740764/91a2ed.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/24556767833.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/merimewapowegeri.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/73946254391.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/40190029147.pdf
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/99549145856.pdf
    • https://cdn.shopify.com/s/files/1/0437/6353/1933/files/meviso.pdf
    • https://cdn.shopify.com/s/files/1/0434/1750/1853/files/esl_possessive_adjectives_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0441/1896/6424/files/golf_course_website_design_templates.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_off000054af.bin
b4836219801b39e5fbb0a39f6866daeb952116364f11823ef0a547ee3f8a69d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54AF 5204 bytes
font_01_sfnt_off0000667c.bin
66f431dffcffc58502ebbd82126b8701d051ee95db9364f69a8d3e6999cf9f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667C 9968 bytes

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