Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2850b645a3d215…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 06:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e61b6c11f8c3984b16d02175faf4d205 SHA-1: 35a2b536ad941b8c7aa8867ac3f9743e17ea02a8 SHA-256: 7b2850b645a3d2159275a4bcdf06f95031638206ce69c7a85ec2c0356514f724
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector hosted on ttraff.ru, which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'sound forge serial number' and numerous links, suggesting a lure to a link farm or phishing site. The ML classifier also strongly indicated maliciousness.

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=sound+forge+serial+number
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d698581ab6b34881bb95e69b237368cf.pdf
    • https://static.usrfiles.com/ugd/1813b3_537ce47cc28a4db2ae0e8cdf0fef9cf5.pdf
    • https://static.usrfiles.com/ugd/9b5f63_288094f2a10e43768c3fd53f9473dddf.pdf
    • https://static.usrfiles.com/ugd/b8c837_86313ea7cb184f0ea31e33c1249df491.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_38c39b8656bb4b27bac217350a236736.pdf
    • https://cdn.shopify.com/s/files/1/0449/6248/0296/files/c5_9fark_c4_b1c_c4_b1.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7859/files/xexiponubomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3810/6023/files/best_blank_meme_templates.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/xuvexuvovadezoje.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/install_minecraft_mods.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/21498674088.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_off00006c35.bin
f255530c9e47007fe272903def56bf31001170e79be33980780c7e240bec1b3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C35 5468 bytes
font_01_sfnt_off00007eb0.bin
ae6828e6089bfb9443629388cf364a4fdb5c9a294e49f34918c256edb6b27812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB0 10472 bytes

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