Malicious PDF — malware analysis report

Static analysis result for SHA-256 709fd25aced94c0d…

MALICIOUS

PDF

43.3 KB Created: 2020-08-14 10:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15f8893322002c1031321baef510c4de SHA-1: 12a944bdfb1d0262c3832df5d53ae953ed1a236d SHA-256: 709fd25aced94c0dad82efff4028a150d2e387528c65232754fd559a5f5ca634
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for free music downloads, aiming to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL suggests an attempt to deliver a secondary payload or phish for credentials.

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=ac+dc+discografia++free
    • http://files.mydancedimensions.com/uploads/1/3/0/7/130776081/5b3d689ca2ab594.pdf
    • http://files.regainhealthnh.com/uploads/1/3/1/1/131163747/923920.pdf
    • http://vugenewe.candeetrain.lt/uploads/1/3/1/4/131483068/janumumabujigal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/49558542293.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/83064187899.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/91981883124.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/81968100941.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/tomuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/fadulesibori.pdf
    • https://cdn.shopify.com/s/files/1/0441/0513/8328/files/soruxefi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6597/files/65943054410.pdf
    • https://cdn.shopify.com/s/files/1/0440/5451/1766/files/bloqueo_av_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/bewezabem.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_off00006194.bin
202cf9b02c8de05e7a38caead7b7c3eb4bd2a3274b770c1e91033ee671a4c458
pdf-font-stream PDF embedded font (sfnt) at offset 0x6194 5144 bytes
font_01_sfnt_off0000731d.bin
025e44f3008d9e2c0ebdbbe0511c5a5485e87d3f97841906ecc1e25eadd4e603
pdf-font-stream PDF embedded font (sfnt) at offset 0x731D 14576 bytes