Malicious PDF — malware analysis report

Static analysis result for SHA-256 acafb10e7b961625…

MALICIOUS

PDF

40.2 KB Created: 2020-08-14 05:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76505b97763b32c73ab9d19215ae8d64 SHA-1: 710319b6da4f82398b214e3b2e8a6439b14077df SHA-256: acafb10e7b961625fe8850e539fde6a55cf12f156cd78a0583c24e37494642ec
180 Risk Score

Malware Insights

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

The PDF contains an embedded script payload and a malicious redirector link, indicating an attempt to deliver further malicious content. The document body, though heavily obfuscated, contains text related to PDF editing and URLs that are part of a link farm, suggesting a lure to entice users to click on the malicious redirector. The embedded script is likely responsible for initiating the redirection or downloading a secondary payload.

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.
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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=edit+pdf+adobe+acrobat+x+pro
    • http://porubixot.foothillsflyingclub.com/uploads/1/3/1/0/131070374/wejiwufalawe.pdf
    • http://dapaja.blendily.com/uploads/1/3/2/3/132303189/balani_darekubesep_vogolami_mefajodajufad.pdf
    • http://xawanumav.teressamediumreadings.com/uploads/1/3/1/3/131383284/gudaburipi.pdf
    • http://files.rmmfoundation.org/uploads/1/3/1/6/131606392/9231578.pdf
    • http://pajep.vancen.org/uploads/1/3/0/8/130814674/1993498.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/monosacaridos_definicion_y_ejemplos.pdf
    • https://cdn.shopify.com/s/files/1/0447/5705/7685/files/68811463461.pdf
    • https://cdn.shopify.com/s/files/1/0436/6709/5705/files/iowa_odometer_statement.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/gaxix.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/fixasaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2176/2723/files/10_000_reasons_chords.pdf
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/foxigifixabaxexet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/43350687418.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/jigov.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2856/files/wefutifiwokepozomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/admin_template_free_for_laravel.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/dubuzaguxizepir.pdf
    • https://cdn.shopify.com/s/files/1/0435/8494/6333/files/automate_the_boring_stuff_with_powershell.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
embedded_pdf_script_00003708.bin
dd4dd521f9398b3f388b1f1d2f0505d51b6c229544fc993c56919a20bbb38945		 pdf-embedded-script PDF decompressed stream script payload at offset 0x3708 100 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
font_00_sfnt_off00006107.bin
74736c3e88c8434145c1edd171ae5374539cb68b6f83308991eea62646cd14ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6107 5104 bytes
font_01_sfnt_off00007276.bin
fd8dedc915636ab05825bad07dee82dbe9b65cf81403d8be4d1d911ca474d2ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7276 9776 bytes

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