Malicious PDF — malware analysis report

Static analysis result for SHA-256 37153138accdf1de…

MALICIOUS

PDF

43.9 KB Created: 2020-08-29 19:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c85125ee57cb3798e94dca56b515a88 SHA-1: f635821e6722a03949ce05dec94137df1bf8b2de SHA-256: 37153138accdf1deb957da668515b7573f8b039f448125895af83bb413b8ae4f
92 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Ielts reading answer key pdf'. The primary malicious IOC is the URL https://ttraff.ru/wix?keyword=ielts+reading+answer+key+pdf, which is flagged as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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=ielts+reading+answer+key+pdf
    • https://static.usrfiles.com/ugd/4dd980_08d0027c166e4e87be9da24e87de2da7.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4b4e6ad63e74aae84127cfbd282512b.pdf
    • https://static.usrfiles.com/ugd/b3bc21_e43a2b1f18d24ba18a830575366e0013.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae0e9126a33546a8a2ba2eddea92654a.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/17864108408.pdf
    • https://cdn.shopify.com/s/files/1/0435/7256/0033/files/white_and_rodgers_thermostat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/wifafipakokovavir.pdf
    • https://cdn.shopify.com/s/files/1/0433/2870/0571/files/nobiwidewir.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_off00006d6e.bin
9f4b57a7602ecc61af7269a5382beac90d570b79787036dd7c1cae4045bc29d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6E 5404 bytes
font_01_sfnt_off00007ff6.bin
38471364286d33f1642fde8c5a3310c5a6f82b81fbd1401d2c1762af9edf8fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF6 10440 bytes

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