Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1f085ad0bfca41…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 16:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0534e6b6066185059099b017e66b5ae1 SHA-1: afce43fc15258267cad240f991464e98f958c0c6 SHA-256: 6c1f085ad0bfca414b6c98178070d9bab8023e257b9407728492f4952780433a
162 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to a redirector service, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and a 'download button' heuristic suggests the document is designed to trick users into navigating to malicious sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=jio+mobile+in+play+store++video
    • http://files.christchurchdayschoolmtp.org/uploads/1/3/1/4/131438819/mubebepisadarefol.pdf
    • http://sojod.twyfi.org/uploads/1/3/0/9/130969772/sexat.pdf
    • http://files.regulatorycheckbook.org/uploads/1/3/1/4/131453536/fikunugutumowi_fenazaxuwanezuj.pdf
    • http://tajobapas.solcreative.co.nz/uploads/1/3/1/4/131453194/8675501.pdf
    • http://files.theatreodyssey.com/uploads/1/3/0/7/130776110/pikeboji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0894/2492/files/a_level_physics_roger_muncaster_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1714/2433/files/catholic_apologetics_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/pivemeromituladozijom.pdf
    • https://cdn.shopify.com/s/files/1/0436/4907/3312/files/bagpipe_sheet_music_amazing_grace_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7441/1926/files/66016557049.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2240/files/48368254070.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/bogetiwekopuvop.pdf
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/alto_adige_quotidiano_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/integer_to_string_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/45923118791.pdf
    • https://cdn.shopify.com/s/files/1/0437/8761/6413/files/8th_grade_spelling_words.pdf
    • https://cdn.shopify.com/s/files/1/0438/0078/9154/files/delaware_driver_s_manual.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_off00006356.bin
24ff7cf4d54c61e5e777e9cf546ce26079433d302d9b418013150512b9fd8833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6356 5396 bytes
font_01_sfnt_off00007593.bin
f49c2002d9d8e190926a2f1b9dfd7891b7c0a72c975041030e1928ba30cb2e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7593 10744 bytes

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