Malicious PDF — malware analysis report

Static analysis result for SHA-256 0837fd9b598836eb…

MALICIOUS

PDF

51.7 KB Created: 2020-08-22 18:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9161e892807d747525c8853714aa3bfc SHA-1: 0c9aa667777f5b8ee162305f2815b716228881aa SHA-256: 0837fd9b598836ebba57595414ce984aaf62258863b7542ff65c7b0a29d581f4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link disguised as a download for 'Fl studio 20 autotune plugin' which redirects to a malicious URL. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=fl+studio+20+autotune+plugin
    • http://tonupiz.oceanvalley.co.uk/uploads/1/3/0/8/130814328/risasezoxajopuligi.pdf
    • http://biwoxariv.mhes-ses-bandstrings.com/uploads/1/3/0/7/130776132/83f9b973bfd75e6.pdf
    • http://files.highalpinegenetics.com/uploads/1/3/2/6/132695601/wugaxofosakew_rotonenixu_mosujamasuxes.pdf
    • http://risufoma.djkochymix.com/uploads/1/3/1/3/131384169/rosabilu-vafad-mupebonojazutu-muzumif.pdf
    • http://ketazun.ghanaedcollaborative.org/uploads/1/3/0/7/130776068/rasagumimut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/fofilixamokanasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/diablo_3_xbox_one_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0439/0099/3691/files/game_god_of_war_200mb.pdf
    • https://cdn.shopify.com/s/files/1/0432/0110/1984/files/tecnicas_de_la_auditoria_informatica_yann_derrien.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/merge_bmp_files_to.pdf
    • https://cdn.shopify.com/s/files/1/0434/2684/0738/files/spicer_u-_joint_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/46801257675.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.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_off00008c5f.bin
7d0e0b37daac95f333e7e0aa990e87fbfa4fc48ce8af0390f1117dc038cc363d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5F 5260 bytes
font_01_sfnt_off00009e50.bin
eed86dfe020dc8a14e9e91a688d98017857b46bbbccf5a000bdff5e0e56023c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E50 10364 bytes

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