Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7bcbaebff856dc…

MALICIOUS

PDF

42.3 KB Created: 2020-08-26 23:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4468cda2e4a82921794e31864f185d0 SHA-1: ff87788de66ac2bcf188e71b443b74a54e2f3bd2 SHA-256: da7bcbaebff856dc22e755b564ad8b6b8f29afd9960df39089d7c4b64aeddd93
150 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate malicious intent. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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 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=le+dernier+jour+de+ma+vie+pdf
    • http://files.mknhp.org/uploads/1/3/0/7/130776158/2153881.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/rijud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/78294600419.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6396/files/29634887776.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/pokemon_sword_and_shield_evolution_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/0247/6190/files/wurofaxojobogomibunil.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/53244883589.pdf
    • https://cdn.shopify.com/s/files/1/0445/2777/9999/files/wazaraxelerapu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/92430471993.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0917/files/28155657989.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000635e.bin
44f416c9d72916005ffe563cba7d76d6ad000b059210326867ad33ce7ff7e785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635E 5056 bytes
font_01_sfnt_off00007485.bin
2b65d347357313357132dbc243863f30f122f12f368c475f53acb05695a8caac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7485 12040 bytes

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