Malicious PDF — malware analysis report

Static analysis result for SHA-256 143cb9aad51c7696…

MALICIOUS

PDF

47.6 KB Created: 2020-08-10 22:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63ef5f15154dd987efe09afc3340e154 SHA-1: 429ab927ef2530e7362dd2ec1bcdfade64ccfb75 SHA-256: 143cb9aad51c76966fcdf64d8fa38fd2706a43615600199d0f9463ccaf61bf4b
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'admission guide'. The presence of a link farm and a malicious redirector indicates an attempt to lead users to potentially harmful websites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=amu+admission+guide+2020+pdf
    • http://files.honestdefender.com/uploads/1/3/1/6/131606502/013de20d44540.pdf
    • http://mutuxot.janeincolour.com/uploads/1/3/1/8/131856725/1567978.pdf
    • http://files.electricianlivingston.org/uploads/1/3/1/4/131437117/taviruzebubosaw_putup_gijogofudegomi_wabegolofufej.pdf
    • http://files.ikargb.co.uk/uploads/1/3/1/4/131409170/c416f2d8c877.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/1415/6451/files/isometric_and_orthographic_drawing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/2509/7126/files/43028545939.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5738/files/mosumelatixuwusijozutege.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/desiwuvejofobilezodukaxep.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/texopamavewozafine.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/32430605369.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/29656602378.pdf
    • https://cdn.shopify.com/s/files/1/0427/5542/4423/files/83608107334.pdf
    • https://cdn.shopify.com/s/files/1/0433/7781/9802/files/pipisigomifege.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/25841195773.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/webuxiwitake.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/28942242020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/bugifitumisimojavu.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_off00007c74.bin
b115caed43c43c96da36eb6606344768fee4aa3efc2ca3e89ff8b9a8a5c1de23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C74 5496 bytes
font_01_sfnt_off00008f19.bin
54d109cae12f45206cf28a77dc17e2ca99a89babbc3fa1671e6e93dc4cda933f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F19 10080 bytes

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