Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f9c8b6a3d6e2c0…

MALICIOUS

PDF

40.6 KB Created: 2020-08-17 03:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 263d733499c6fac3f1c4bc475d25814b SHA-1: 8fc27668d29328dd9a24b601029f8b945129889e SHA-256: c7f9c8b6a3d6e2c0b87cdfa99606b0b00743455ba1404b86c25e31f6d2ebef8a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link that redirects to a known malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, includes text suggesting a lure related to 'Liver test report analysis'. The presence of a large number of external PDF links, as indicated by 'PDF_SEO_LINK_FARM', suggests an attempt to generate traffic or distribute further 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.com/pify?keyword=liver+test+report+analysis
    • http://files.jreelzmusic.com/uploads/1/3/1/8/131856170/vomegapinegoxijom.pdf
    • http://files.digital-human.org/uploads/1/3/1/3/131383467/jutotinoni_damilabawugise_fujide.pdf
    • http://biwakizib.olenaluggassi.com/uploads/1/3/2/7/132740718/lujodirarikoxu.pdf
    • http://files.prettyandpinned.com/uploads/1/3/0/7/130739452/pazunokikoxituv-gomisav-velafozok.pdf
    • http://files.gleasonbrosracing.com/uploads/1/3/1/4/131438442/067e4f9.pdf
    • https://cdn.shopify.com/s/files/1/0437/7450/9213/files/46383441492.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/boulevard_of_broken_dreams_guitar_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0440/6083/6005/files/sekaxuzuterawesomujegum.pdf
    • https://cdn.shopify.com/s/files/1/0431/8494/7357/files/pokemon_showdown_fakemon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofexunixepufatomubudabak.pdf
    • https://cdn.shopify.com/s/files/1/0435/4002/1407/files/learning_by_doing_richmond.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/actos_de_habla_austin.pdf
    • https://cdn.shopify.com/s/files/1/0434/2782/3778/files/email_template_for_customer_service.pdf
    • https://cdn.shopify.com/s/files/1/0432/7656/6684/files/pedejimopajuralogefu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9657/0024/files/possessive_pronouns_exercises_1_eso.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_off000064fc.bin
5173857d99db880a06906041e7fad9724a092f03f0339b0eaebe8d0ac903926a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 4916 bytes
font_01_sfnt_off000075d1.bin
6835d3c9f37d6930d6e751fa0212ff6d28fe4c4f3ebfae9fbc107dde81f713fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D1 9348 bytes

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