Malicious PDF — malware analysis report

Static analysis result for SHA-256 6276feb01bd26ebc…

MALICIOUS

PDF

41.1 KB Created: 2020-11-04 10:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a008a44069f9c21a2ab2095a58e4bb6 SHA-1: c4414f5361d1b4aa2cc87516553a638b749368a1 SHA-256: 6276feb01bd26ebcf830c75056685c9d4369f89386e51c335a9f47124683b66c
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings. The ML classifier strongly indicates maliciousness, and the presence of a download button lure further supports a malicious intent to redirect the user to harmful content.

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/aws?keyword=traceable+letters+printable+large
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/5224704e.pdf
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f9fab36cee4e.pdf
    • https://jisasulozif.weebly.com/uploads/1/3/4/3/134371627/fupilowud.pdf
    • https://wofinomedek.weebly.com/uploads/1/3/4/1/134108675/2054848.pdf
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/db38ff4391e1eff.pdf
    • https://kudizuvawemexol.weebly.com/uploads/1/3/4/3/134307781/ccf20bf819.pdf
    • https://fumadutukit.weebly.com/uploads/1/3/1/4/131437402/vosituvemap.pdf
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5fa122970d36f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/dff8e2be-ef28-4d01-a35b-c24c68f8ff3e/34909678717.pdf
    • https://uploads.strikinglycdn.com/files/dc623c89-9673-4210-aa61-c63d3bff41bd/34740012607.pdf
    • https://uploads.strikinglycdn.com/files/082f425b-bc62-4630-aceb-f7f7c831773e/kingroot_apk_4.0.2.pdf
    • https://uploads.strikinglycdn.com/files/1aa8b3a4-eb85-4ffc-8b92-2d188474ec19/wizidemokogufipofopofoz.pdf
    • https://uploads.strikinglycdn.com/files/8006ba45-aac7-490d-9181-f568c54972cb/lodavixewi.pdf
    • https://uploads.strikinglycdn.com/files/04aec591-acc9-48b7-8ea6-f06a3a46aa82/xekesej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000554b.bin
85a36b597163168456d058e3d67ff24fb910dbcce15493f7654ec7106a21e3cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x554B 4868 bytes
font_01_sfnt_off000065d9.bin
c37771ea9b150b4198afe2df3fcc6a3ea8dd66e51a5fbc1ad410410cc06ebb9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D9 10436 bytes
font_02_sfnt_off0000894a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894A 4324 bytes

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