Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f99d7e6b5b277f…

MALICIOUS

PDF

41.4 KB Created: 2020-10-09 13:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc95e56b324d898648b0ce62fd3a0b56 SHA-1: e08398992a12212d85e96926cdefbf831289e12e SHA-256: a8f99d7e6b5b277fd6dfdb2899df4561dde54c921983bde271e8e35c7220c640
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body also contains a URL that points to this malicious domain, suggesting an attempt to trick the user into downloading a payload or visiting a malicious site. The presence of a 'download button' lure further supports this malicious intent.

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://cctraff.ru/strik?keyword=format+remedial+dan+pengayaan+kurikulum+2013+doc
    • https://site-1039675.mozfiles.com/files/1039675/winejagijovifasu.pdf
    • https://site-1041933.mozfiles.com/files/1041933/5823567536.pdf
    • https://site-1036929.mozfiles.com/files/1036929/81635185082.pdf
    • https://site-1036981.mozfiles.com/files/1036981/26924501985.pdf
    • http://files.westervilletherapy.com/uploads/1/3/1/4/131454270/givunomufuses-vazoriv-kizexodu.pdf
    • http://juwuvu.thedinanschoolofballet.com/uploads/1/3/2/8/132814342/loxov.pdf
    • http://files.unitedalapahabulldogs.com/uploads/1/3/2/6/132681542/tanenulapeget.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9fc8ee6b-e31f-423e-a521-a8092d855fa3/sonaxigekudotapa.pdf
    • https://uploads.strikinglycdn.com/files/d6f3f37b-3492-4c11-8d68-f6a3fa6a3219/natetalorulepiwigejusesu.pdf
    • https://uploads.strikinglycdn.com/files/2161d383-9406-4c6a-92bf-07baf0e39754/16325292971.pdf
    • https://uploads.strikinglycdn.com/files/6865d7c9-81a6-4c71-a5bd-83b4b566c410/weduloda.pdf
    • https://uploads.strikinglycdn.com/files/cc052c9d-3d2d-4464-be39-6059176a72f0/84677662761.pdf
    • https://uploads.strikinglycdn.com/files/b533d381-29fe-46b8-b008-a95d7cedfb84/6453002864.pdf
    • https://uploads.strikinglycdn.com/files/f3777c20-4764-4fcf-988b-19280053a95d/74588460251.pdf
    • https://uploads.strikinglycdn.com/files/3992c2b3-d3f1-4922-9d52-25652d0510c0/fokadurobetetubotalitil.pdf
    • https://uploads.strikinglycdn.com/files/ed3cfa60-e931-4346-83ea-e3558e780cad/40670354141.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_off000062dd.bin
154097206670dee0c35f99cd09f635061a38875449012dd2ed06d23eddbf7ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DD 5828 bytes
font_01_sfnt_off000076b1.bin
29555e0d6793964bc9a1f676a6d92d03e2720e108e9ed13b0aa474723d65e831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B1 9812 bytes

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