Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b457bfab5178b9e…

MALICIOUS

PDF

33.8 KB Created: 2020-08-13 09:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d588b030cfde6ea4ffa16c0834ef99ce SHA-1: dd887ec47106a610b82a2ff47c975ecec5067493 SHA-256: 4b457bfab5178b9ed22f60af7d6afd551531ad976cfcfaae66a06c4f19bf3000
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to "nurse assistant training textbook pdf" and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=nurse%20assistant%20training%20textbook%20pdf
    • http://wiwakasav.acdzvideo.com/uploads/1/3/0/8/130814328/rililaziz.pdf
    • http://forapogif.quintepaddlingclub.com/uploads/1/3/1/4/131406665/fimibaviwa_wabamaxofuwapur_womadadugomu_lovipokutedani.pdf
    • http://xididemut.working-class-women-writing.co.uk/uploads/1/3/2/7/132711991/logumukuwo_jasoga_videwatosarugun.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/97642627831.pdf
    • https://cdn.shopify.com/s/files/1/0434/4666/5382/files/luxudiwaxikatonezelik.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/adm_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4711/files/tidemonunevawavugatino.pdf
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/36030456848.pdf
    • https://cdn.shopify.com/s/files/1/0434/4971/2807/files/coreldraw_tutorial_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6622/0956/files/dijepepuvi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/betivoduxanaxuwobodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/fuzumakowitogopikanovisom.pdf
    • https://cdn.shopify.com/s/files/1/0432/4029/2520/files/why_do_cave_fish_lose_their_eyes_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/bilumisisu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6212/files/23523504494.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/86915759895.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_off000048a0.bin
8d9b9d8534b80a6de659715ad51d14c911f1009f6699a316bd5998eb7eb403b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48A0 5420 bytes
font_01_sfnt_off00005b1f.bin
1b671e335d0ced0b3f9ddc74be91e23c919b1d6707a7d122e2b8801fa133558d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1F 9460 bytes

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