Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a48c6be664df47…

MALICIOUS

PDF

42.3 KB Created: 2020-08-22 13:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e391b16339824c378b5afb5cefde43b4 SHA-1: ef7620d1e5d89220f8a4d471c6495a003450e782 SHA-256: 16a48c6be664df4726739fbcfc41026aa6c27d0cfed1d260b63d2b86c4141fcc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains the malicious URL and references to other benign-looking PDFs, suggesting a link farm or redirection scheme to distribute further malicious content.

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=the+bronze+horseman+pdf
    • http://files.sandylakemuseum.org/uploads/1/3/0/7/130776511/sazubujozil_kokovo_vofetab.pdf
    • http://files.euwanderlust.com/uploads/1/3/1/8/131856492/juxajewigef.pdf
    • http://files.silhacommunications.com/uploads/1/3/2/7/132712603/nenijunenav-tafazoj-nujejenoxel-vixojixugesixo.pdf
    • http://mamojeki.littleblackdoggrooming.com/uploads/1/3/1/6/131636612/vugonogetoko-jinufa-tatem.pdf
    • http://files.tarringtonswimteam.org/uploads/1/3/1/1/131163980/zodozumijefajaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/9366/0582/files/bapasabopojuvo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/jipafafixulugona.pdf
    • https://cdn.shopify.com/s/files/1/0431/7052/9436/files/87183210717.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/guxod.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/diagnostico_de_impacto_ambiental.pdf
    • https://cdn.shopify.com/s/files/1/0432/5985/5012/files/nsk_pillow_block_bearing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/joyce_vedral_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/1590/5185/files/bewitifagugegoxo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3327/1191/files/anencefalia_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/author_s_purpose_worksheets_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/internship_project_report_format_mba.pdf
    • https://cdn.shopify.com/s/files/1/0436/2184/3106/files/31931776949.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/third_anglo_afghan_war.pdf
    • https://cdn.shopify.com/s/files/1/0437/6667/7655/files/30771950200.pdf
    • https://cdn.shopify.com/s/files/1/0432/3944/0543/files/poovarasan_kattikidalam_video_song.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_off000067a5.bin
64ff7683aab417d963634599a7563ee04b057731348305b67654cbe4788a1e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A5 5388 bytes
font_01_sfnt_off000079ca.bin
b1dc19b54e7d7f0296e24e0ddb237bd0f90fdde3b7502201decf4df5c3ab9add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CA 10056 bytes

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