Malicious PDF — malware analysis report

Static analysis result for SHA-256 c564b2396894ab1a…

MALICIOUS

PDF

33.6 KB Created: 2020-11-09 10:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8edca37564b1badf0317c2f956a172d0 SHA-1: 1c71939fceb8de340ee6a7b29692c9c619cb6d16 SHA-256: c564b2396894ab1a672fd739db23add72ac5ef4a895c23b19149f463ca230b9b
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to PDF files hosted on external sites, indicating a link farm for SEO manipulation or to distribute further malicious content. One critical link directs to known malicious redirector infrastructure. The presence of a 'Password-protected archive handoff' heuristic suggests this document may be a lure to trick users into downloading an archive, which would then require a password provided by the document to decrypt a payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffmen.ru/aws?keyword=conjuguemos+spanish+login
    • https://zawiferodabubap.weebly.com/uploads/1/3/4/4/134447725/sozowexusoleb-sopeze.pdf
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/nukexifepejisox.pdf
    • https://mejawazur.weebly.com/uploads/1/3/4/2/134265830/8dd7d8ccbd.pdf
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f8af52c1857c.pdf
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f998d2b789f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zerofizuko.files.wordpress.com/2020/11/canadian_c_spine_rule.pdf
    • https://pavezisetapo.files.wordpress.com/2020/11/namejifefofiwikok.pdf
    • https://paxajupivog.files.wordpress.com/2020/11/zikin.pdf
    • https://minezonateta.files.wordpress.com/2020/11/71909694747.pdf
    • https://jinugobax.files.wordpress.com/2020/11/45695055110.pdf
    • https://pavokido.files.wordpress.com/2020/11/attestation_letter_of_good_character.pdf
    • https://xanafegeze.files.wordpress.com/2020/11/20431748474.pdf
    • https://ruvujawiwubu.files.wordpress.com/2020/11/up_tgt_pgt_notification_2016.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_off0000442d.bin
bf0cbb718550a0336d9d674560dc6fae56e2493cdd7a034bb66850c501082f61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x442D 5116 bytes
font_01_sfnt_off00005573.bin
ce7b8876427e70515b0527f5b706872018748899e5c657b54fdeb34516ebfc33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5573 11028 bytes

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