Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5e1955cbcdff31…

MALICIOUS

PDF

39.5 KB Created: 2020-08-16 18:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ee1b77889b2dd38964616139a98ec6e SHA-1: b4114a968fbe4404fc0389e1cf690c786a6326e1 SHA-256: 6d5e1955cbcdff31013738985894f599ba5aff2862ba2ad58ce6c6864b5afd2e
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 external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is presented in the document body as a font download. This indicates the primary goal is likely to redirect users to malicious content or phishing pages.

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=adobe+caslon+pro-+semibold+font+free
    • http://sogurotuf.themojoradioshow.com/uploads/1/3/2/7/132712072/gurusakozopinaw.pdf
    • http://files.coffeesonme.com/uploads/1/3/2/7/132741430/vamelosuxogonajolopu.pdf
    • http://files.skylinebitandspur.com/uploads/1/3/2/3/132302999/4cd9ed6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0672/2211/files/kotirujikus.pdf
    • https://cdn.shopify.com/s/files/1/0438/5816/5925/files/2014617219.pdf
    • https://cdn.shopify.com/s/files/1/0429/4616/6943/files/76278401889.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7118/files/6219689111.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/biology_1st_year_book_sindh_board.pdf
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/mafadizogakafev.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/html_input_type_file_only.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/balancing_equation_in_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/avian_influenza_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/badepofarejigebomajuwid.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/mapamundi_con_nombres_a_color.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/68665046960.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8115/files/22337571677.pdf
    • https://cdn.shopify.com/s/files/1/0434/4617/3852/files/mechanism_of_heterogeneous_catalysis.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9177/files/basic_civil_engineering_ktu.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_off00005181.bin
5e0ff58ff967bf465fe3474e5789e1ce3a11459865cc604dc6aceb0e763127a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5181 5460 bytes
font_01_sfnt_off000063f2.bin
a0e96950de5d2d0fb4ce25cd5c6c59ce3d7e57dee912564ef4a73cfb506dda3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F2 14460 bytes

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