Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8523141f262b17…

MALICIOUS

PDF

40.2 KB Created: 2020-08-16 22:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15a75a7cc7a56a9715b532678b95ab23 SHA-1: b6cd57a0056291e26ad2437c56a79043040fcbed SHA-256: df8523141f262b176cf00c8d75e182a8c69d3ba5d273b5bba5beedcb41fdd649
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=accu+chek+performa'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. 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/pify?keyword=accu+chek+performa
    • http://files.soulbeing.net/uploads/1/3/0/9/130969573/devaxabiw.pdf
    • http://jotunewi.stteachinguk.com/uploads/1/3/2/8/132816202/88ef01d58.pdf
    • http://wugami.richmondeducationfoundation.com/uploads/1/3/1/4/131482933/pakamibumifo.pdf
    • http://galidam.keramaris.gr/uploads/1/3/1/4/131408738/puwidetulug_zuzozumen_kutaxafunup_jasekenununide.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/edital_policia_rodoviria_federal_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/17317350051.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/pdf_unlock_file_open.pdf
    • https://cdn.shopify.com/s/files/1/0435/3123/9588/files/soxuvuxosakaruseso.pdf
    • https://cdn.shopify.com/s/files/1/0433/4786/9850/files/59765158536.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/che_guevara_history_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/islamic_dream_dictionary_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9422/files/wimazufipeturopanetifuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/4242/1398/files/xosevesivepelasow.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e0c.bin
3603fa34fe530df5338b6cc6ef09c4a86fdd67202d3095f9401e236fb203d8b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0C 5100 bytes
font_01_sfnt_off00006f41.bin
11f0587f6afbd6683fe3685572c13bab24834f86fdcfe13c87d73393ed27d0af
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F41 10944 bytes