Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cf47b0592522a9…

MALICIOUS

PDF

36.8 KB Created: 2020-08-12 22:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da494efaa04cad36e37e0427d1dd33ed SHA-1: 43976703e1a498eb6717a2de4309ab4663904e17 SHA-256: 75cf47b0592522a9d386edc347eac87be0760020fccfea7fb688854cf0898207
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=adobe+indesign+cs6+classroom+in+a+book+pdf+free+download'. The document body and heuristics indicate a lure to download content, disguised as a software book. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm.

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=adobe+indesign+cs6+classroom+in+a+book+pdf+free+download
    • http://files.centerforwomenfaithandleadership.org/uploads/1/3/1/6/131637606/mumolizit.pdf
    • http://files.jeffreyschmelkin.com/uploads/1/3/1/4/131410545/kimedubosebovude.pdf
    • http://files.gracelaurent.com/uploads/1/3/1/8/131872070/3967525.pdf
    • http://mofeviji.islandphysics.com/uploads/1/3/1/0/131070161/ledez.pdf
    • http://files.skyleblanc.com/uploads/1/3/0/7/130740442/katavuvakunol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3321/4621/files/guvemexifatu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9721/8471/files/socioeconomic_barriers_to_learning.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/rokadatu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3101/files/developing_management_skills_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/l_aleph_borges.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5772/files/where_are_the_hosts_files_in_windows.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/royalty_statement_excel.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/audi_q5_2020_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/togovuzamazoxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/mazinorozat.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_off00004c8b.bin
b43ff448e0faff7438658dcee0cd2e0d7a4e2a5fc254f8f460d33235beba513f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8B 5916 bytes
font_01_sfnt_off0000609d.bin
87e17b8207aee47a6c8fe011db4115f9d006a91d515545aa0cca6aea8dafc75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609D 10448 bytes

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