Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d77990fddf9349…

MALICIOUS

PDF

48.1 KB Created: 2020-08-14 03:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaddb129a3f40fa23c49a937685b3d8c SHA-1: ffd7b6af39a9d787533a12529bb465f764ff4889 SHA-256: f3d77990fddf93499d5457eb1f9858b78a1af4d718a8994e4e8fe7d562c4de8c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a redirector, which is a common tactic for delivering malware or phishing pages. The document body, though heavily obfuscated, contains text related to 'Acrobat professional free trial' and a URL that strongly suggests a lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a malicious redirector. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=acrobat+professional+free+trial
    • http://files.volunteerhainesjunction.com/uploads/1/3/1/0/131071019/d2682cb5.pdf
    • http://files.margueritelacorte.com/uploads/1/3/0/8/130814172/wekux.pdf
    • http://files.six-tech-usa.com/uploads/1/3/0/8/130814043/gijarotol-vodefil-lujapo.pdf
    • http://jazokesaf.isaiahtremainebooks.com/uploads/1/3/0/9/130969744/zapuror.pdf
    • https://cdn.shopify.com/s/files/1/0431/6017/4754/files/30209347723.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9496/files/wanizexujota.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/1869369806.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/dominos_uk_menu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/valasupuxuzitete.pdf
    • https://cdn.shopify.com/s/files/1/0445/4642/4991/files/xemimekenexozedi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/telescopic_banner_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/nojovef.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/32017448020.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5015/files/35031328726.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bugos.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/gotedegezexiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/xezokefewelalumar.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f97.bin
8b6124d67a6ad7194eb6001490308447c311a404c4425713888d2f71f5f76dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F97 4928 bytes
font_01_sfnt_off00008054.bin
ef90221a918adefc7f3bbdd606a7dbec849e3d729b77f9585b37205fcba9f898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8054 10836 bytes
font_02_sfnt_off0000a567.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA567 4324 bytes

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