Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bfbd076eb158a5…

MALICIOUS

PDF

37.5 KB Created: 2020-08-28 23:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa3927216d5c996e86b279fb1f50a6d SHA-1: 267b287c69da627cabc08bec9b83ce11b5ff81d8 SHA-256: 18bfbd076eb158a59a41ab8a11ca193dd5c0c4205752bd730b6a77a00e3f363e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains the primary malicious URL and several benign-looking URLs hosted on Shopify, likely to appear legitimate. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to redirect users to harmful content.

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/wix?keyword=his+mercy+is+more+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/8562522198.pdf
    • https://cdn.shopify.com/s/files/1/0464/5198/2504/files/i_drive_safely_drivers_ed_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4411/files/luluxowimetajok.pdf
    • https://cdn.shopify.com/s/files/1/0435/0060/1504/files/virufikifa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/hunter_preraid_bis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/87935205601.pdf
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/veduditu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/9840742677.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/mawene.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/71387884245.pdf
    • https://cdn.shopify.com/s/files/1/0431/2878/3002/files/22655237461.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/winoxilerudizixadejugo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5446/5175/files/36960158058.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8701/files/custom_action_sheet_ionic_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5239/files/business_communication_writing_skills.pdf
    • https://cdn.shopify.com/s/files/1/0434/6560/5286/files/p90x2_fitness_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004807.bin
445fa7dca89a02654cc0411421fd0c54f62502e06a4fc0c5060efed1a3bf6b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4807 4636 bytes
font_01_sfnt_off000057cd.bin
feb0fddccc30dd903945c9f692fb201a4a93950be7db55aa963952e0123ec51b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CD 10320 bytes
font_02_sfnt_off00007b29.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B29 4324 bytes

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