Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b39b9199f58927c…

MALICIOUS

PDF

55.8 KB Created: 2020-08-30 10:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a524f08061bc397b9088d232b7f492b SHA-1: bd58fb7e1ae70dedfcf10f9c6830dd40817a21b2 SHA-256: 7b39b9199f58927c9e872944cb2a330343045cf02fe20bd9933179525b3e19bc
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 pointing to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.ru/wix?keyword=athrabeth+finrod+ah+andreth`. The document body, though heavily obfuscated, contains this URL and other PDF links, reinforcing the link farm tactic. The ML classifier also strongly flagged this PDF as malicious.

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=athrabeth+finrod+ah+andreth
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/gemasipugozereforu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/video_er_for_facebook_without_login_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/all_rotom_forms.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4f7ac90e6dd4d6b9195487a5d661922.pdf
    • https://static.usrfiles.com/ugd/804ff6_78768c01a2174873a9e0160f8e48688c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7721a74e7c04820b2f17953fdbb5f10.pdf
    • https://static.usrfiles.com/ugd/34e21e_c0e97780304840c28e529cddd9316495.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f818254eec943c1aa938208a62a87a9.pdf
    • https://static.usrfiles.com/ugd/eed56f_9e827014b7644bd29ef2e1851d91907e.pdf
    • https://static.usrfiles.com/ugd/b8c837_01ea57b9614d43c18c39151d72285354.pdf
    • https://static.usrfiles.com/ugd/e745be_883288b9c6ea4df9a71451937b617a97.pdf
    • https://static.usrfiles.com/ugd/b8c837_c073f7fb8983403b8d56dcbab6aafbb8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000917d.bin
a4bc1312f7a7549d656879f0b2f08756d736233e6d40c97f70912d6c97ff307d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x917D 4704 bytes
font_01_sfnt_off0000a166.bin
6b5a6066d0393b4b4fa33105e705713dda218a989ec5fe848192a49dcdb5496b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA166 10216 bytes
font_02_sfnt_off0000c468.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC468 4324 bytes

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