Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72531628b8f3813…

MALICIOUS

PDF

49.6 KB Created: 2020-08-08 11:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df2266470c159be216c599151ea27398 SHA-1: bbfe61e11ff4b139f23280a0be63366b4bc1a798 SHA-256: c72531628b8f3813213260af10cff37c22b615dc762b51ed71cddf783abead5a
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to ttraff.ru, indicating a redirection to malicious infrastructure. The ML classifier also strongly suggests maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of this link farm strategy.

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/pify?keyword=cationic+polymerization+mechanism+pdf
    • http://xatadufu.ochea.net/uploads/1/3/1/4/131406258/566c33.pdf
    • http://wujisodof.tohrukanayama.com/uploads/1/3/2/6/132683014/6613360.pdf
    • http://zosero.rutoutdoors.com/uploads/1/3/1/4/131437604/mudotudan_memepolobu_gonemuva.pdf
    • http://files.campusconnectsoftware.com/uploads/1/3/1/8/131871687/tatotudave.pdf
    • http://files.claudinegevry.com/uploads/1/3/1/4/131437363/kavusaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6179/5230/files/7656664205.pdf
    • https://cdn.shopify.com/s/files/1/0437/5330/8314/files/utilitarian_approach_to_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0429/6284/5859/files/katoriravemuxilexu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/gym_candy_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0971/files/goxorewajevadizajud.pdf
    • https://cdn.shopify.com/s/files/1/0435/8517/5713/files/27191535358.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5400/files/54851320679.pdf
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/jajowav.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/totusabe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/aladdin_and_jasmine_story.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/2711451594.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/tixukojaja.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007638.bin
635534900b26c374ad584deeba98acbe6b81a386580981e0c172434e65afeee0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7638 5360 bytes
font_01_sfnt_off0000884c.bin
6818910e450e14b19f1f1e06c59a09fe29a3d1e4be67c003574cfe8ef75f17ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x884C 10152 bytes
font_02_sfnt_off0000aaed.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAED 4324 bytes

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