Malicious PDF — malware analysis report

Static analysis result for SHA-256 f924666350222452…

MALICIOUS

PDF

43.6 KB Created: 2020-08-08 07:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 237d090cc6ac02df184b3f27c321b17c SHA-1: f6968143f2c152ffbf50ba70e7e1ee0ed00be309 SHA-256: f924666350222452be123c97bfbfb45d783e0ac641f3516051b079adf8e0faf4
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicating that at least one link points to known malicious redirector infrastructure. The PDF_SEO_LINK_FARM heuristic further suggests a large number of external links, likely intended to obscure the true destination. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the structure and link farm suggest a phishing or redirection attack.

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=bag+s+groove+pdf
    • http://files.fivestark9usa.com/uploads/1/3/0/8/130814127/nasimubawapases_suxovaxit_xegufudof.pdf
    • http://files.simplydivinesuds.com/uploads/1/3/1/4/131407812/23f3d849.pdf
    • http://files.canadianroyalpurplesociety.org/uploads/1/3/0/7/130738534/5237295.pdf
    • https://cdn.shopify.com/s/files/1/0437/6612/0609/files/gomudaxaxekabefugepuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/gaforojavukolodij.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/magofatedokapoken.pdf
    • https://cdn.shopify.com/s/files/1/0433/5337/4874/files/unspeakable_joy_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/4410/1544/files/lapububevizuzi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2720/9120/files/rudajegedujofiwusimoseg.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/bloodborne_old_hunter_weapons.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/51058234605.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/forge_energy_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/aprender_alemao_basico.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/60583081316.pdf
    • https://cdn.shopify.com/s/files/1/0432/1057/1940/files/11821347195.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/6202208429.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/lilowejise.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_off00006ca6.bin
e1b5329e107dde354e2b812d1078bfbd95a3c61d9804657ce8a902c94056aca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA6 5288 bytes
font_01_sfnt_off00007ebf.bin
993586b398a0a8e1a40bf5ab49ac7015a7c01e21445f31947e9e6ee95ea8cc17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBF 10196 bytes

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