Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82f939ab656c1fe…

MALICIOUS

PDF

67.2 KB Created: 2020-08-08 18:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ddd65bfe4b8b7aa7fd57a5c5dbfade5 SHA-1: 8b048c1b16178892bd6fdfda0585b8d67ccd155d SHA-256: d82f939ab656c1fee4c565c050e5506c2225cd2d6d67ca9d0f67e52e7eb2adea
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to a specific manual and a URL that appears to be part of a link farm designed to attract users searching for that manual. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is a malicious redirector link.

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=human+anatomy+physiology+laboratory+manual+marieb+pdf
    • http://files.chadgmalcolm.com/uploads/1/3/0/8/130874610/2104569.pdf
    • http://files.richlandsrbetaclub.org/uploads/1/3/1/4/131406434/waludewonalo.pdf
    • http://files.arcasdesigns.com/uploads/1/3/1/0/131069992/xafejorefut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4567/files/tafijozijovonabomunurejew.pdf
    • https://cdn.shopify.com/s/files/1/0435/5781/4431/files/parametric_design_for_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1356/files/navigators_bible_reading_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3825/files/volibear_pro_builds.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/razoxesafuwodinaruji.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/sojupaxudejufube.pdf
    • https://cdn.shopify.com/s/files/1/0429/4954/2047/files/megubogetokaganofozon.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/fonilewukojube.pdf
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/26199207568.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/eu4_cheat_engine_table.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/53585333942.pdf
    • https://cdn.shopify.com/s/files/1/0432/7132/3808/files/xivuvudizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/muwixulolodowugisuruta.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9499/files/pizibumararuxitatexazepi.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_off0000c773.bin
1d1349544b303752a6e5447aec9fb74b6828bfb54d1c3171bd16b8343d03e965		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 5660 bytes
font_01_sfnt_off0000da84.bin
c31cb5e06409370725c758334c114aab4d3729abde190709fa1481d216084d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 10760 bytes

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