Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c54f5d4d1ff2d0f…

MALICIOUS

PDF

51.3 KB Created: 2020-08-28 06:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6120ccfd3b5928ff706f14f9c521b78 SHA-1: 5a0bad1a6ab30612f917c0f2b76f8982078ceaea SHA-256: 6c54f5d4d1ff2d0f428ad06a84d93e69bc178ceefdb4303837213cba2ca4e1b1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=guia+pmbok+2018', which is flagged as malicious. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the PDF structure and embedded links are indicative of 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=guia+pmbok+2018
    • http://ranumav.klv53.com/uploads/1/3/1/4/131454029/6513399.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6150/1334/files/gowikatajewikoxex.pdf
    • https://cdn.shopify.com/s/files/1/0436/1447/0302/files/warhammer_40k_8th_edition_download_vk.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/19083228268.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/attack_on_titan_no_regrets_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/0088/8469/files/tululu.pdf
    • https://cdn.shopify.com/s/files/1/0448/2118/4674/files/19821466499.pdf
    • https://cdn.shopify.com/s/files/1/0431/0168/3873/files/14331788487.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6235/files/midenod.pdf
    • https://cdn.shopify.com/s/files/1/0441/3331/8808/files/aadhar_card_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/body_language_presentation.pdf
    • https://cdn.shopify.com/s/files/1/0436/2502/1603/files/malesabinejaforixigituf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/96525551506.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_off00007404.bin
309e6ad575bf7d34a8e88c8c8067e2c37f1d66b01b1fb4c4f15da92b16b99f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7404 4992 bytes
font_01_sfnt_off000084fd.bin
35669443597d017ccab840ee345c579847e2249335bd61778e40666df8a02e05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FD 14020 bytes
font_02_sfnt_off0000b13c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB13C 4324 bytes

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