Malicious PDF — malware analysis report

Static analysis result for SHA-256 07171c3bc4128cf6…

MALICIOUS

PDF

34.0 KB Created: 2020-08-31 09:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6a02bb422137df9bbf5f57780385209 SHA-1: 25beb0acb1e9aa88cf5d72537d219f0aa8fd5d90 SHA-256: 07171c3bc4128cf65e47a82684f7f79637a95893f179c9813fb2fa87020dbda1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/wix. The document body, though heavily obfuscated, contains text related to a handbook and the malicious URL, indicating a lure to redirect users to potentially harmful content.

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/wix?keyword=machinery%2527+s+handbook+29th+edition+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5e81b9_f87453f49ead4d9297ef20f727ecb6a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_042ded1c11234268b377a95cc34b3e07.pdf
    • https://static.usrfiles.com/ugd/fb5067_6838410a06a5456d981ac3d918605606.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc315ba13a37423eb33f7e721aefa94c.pdf
    • https://cdn.shopify.com/s/files/1/0428/3524/7271/files/70889879960.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6669/files/6154941133.pdf
    • https://cdn.shopify.com/s/files/1/0465/1909/1358/files/bairavaa_tamil_audio_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/loxutiwijadewafulon.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/99400712503.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/apprendre_francaise.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/what_are_text_structures_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/muforilanemamelenijigava.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/51439136821.pdf
    • https://static.usrfiles.com/ugd/e4bc37_155cbbc26c47469abd8c2b857f530d7f.pdf
    • https://static.usrfiles.com/ugd/6a7407_c355d6a3759f4127af6ead8491f3dfe4.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_fb33e6e674fd4f6db3b1bc6d7db2cd5b.pdf
    • https://static.usrfiles.com/ugd/b4609a_499d0ba892974b0e8ead80bebe4790da.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000496e.bin
0124261aafd42c22443c82716de224490a88e82012bcb92b53ea573cfbabb565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x496E 5844 bytes
font_01_sfnt_off00005d4f.bin
b814eb52d3e63b8534f1e25bf5046c7c29f10c12d7601b11051abd34a0e856c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4F 8752 bytes

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