Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c39be5ce6223ce7…

MALICIOUS

PDF

40.8 KB Created: 2020-08-15 12:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd83f70080a695870ece2c30186b1655 SHA-1: 3868504041df238fdeb4af309d82218a5dd882cc SHA-256: 9c39be5ce6223ce7c3d901d096a6ddd119c1e41ad9923a36367de3d5b688af13
152 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 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and text suggesting a recruitment form, likely a lure. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify domains hosting other PDFs. The primary malicious IOC is the redirector URL, which is likely the initial stage of a phishing or malware delivery chain.

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=calcutta+high+court+recruitment+form
    • http://files.yunilotusconsulting.com/uploads/1/3/1/4/131414743/wuzogefatugara.pdf
    • https://cdn.shopify.com/s/files/1/0430/4004/7253/files/samsung_bd_jm57c_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/fatodugasududuveludukiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/kofujesudobinefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6039/files/perivawurus.pdf
    • https://cdn.shopify.com/s/files/1/0436/1915/6130/files/bagozatajuzububaxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3113/4365/files/15738302608.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4087/files/febefuxuxuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/79563917225.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/ngr_600_100.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_off00006399.bin
62515d15faadbdcd49070c90d5e4e575e4cbc776e7598097dfc26b564e6bbb2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6399 5020 bytes
font_01_sfnt_off00007488.bin
f1a7553ac26c546cd78abf11df2d01ce7766705767feda3d7d396cde486c73a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7488 10016 bytes

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