Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61c0b676ad3497d…

MALICIOUS

PDF

42.8 KB Created: 2020-08-07 14:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b321fe63ba89f0874927a8dfeb01e4d0 SHA-1: d34955de6aa612cd9367a5a967dc986b83d98694 SHA-256: e61c0b676ad3497dee14bce9077a55b7519f7eb8a00e3cd84837640112d92a00
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating the document's primary purpose is to redirect users to malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic suggests this is part of a larger SEO-based traffic generation scheme. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector URL is a strong indicator of malicious intent.

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.com/pify?keyword=capacitor+start+motor+wiring+diagram+pdf
    • http://files.umdwrfc.com/uploads/1/3/1/4/131482941/8209921.pdf
    • http://files.mrstuckeysclass.com/uploads/1/3/0/7/130776841/4143467.pdf
    • http://natulet.missfoggscience.com/uploads/1/3/0/8/130814397/bapirutato.pdf
    • http://files.shepherdhills.org/uploads/1/3/0/9/130969580/nimubutaw-nisadam.pdf
    • http://files.sof-trainingfund.com/uploads/1/3/1/4/131438177/jagelebokonepixofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/zufuxidokonodiludove.pdf
    • https://cdn.shopify.com/s/files/1/0432/8488/9758/files/alkaline_diet_recipe_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/fenezofam.pdf
    • https://cdn.shopify.com/s/files/1/0431/3038/8642/files/dotibarakux.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/fudanegafojuperowuxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8349/files/pefikidiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2965/files/adobe_photoshop_7._0_tutorials_in_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/99312097895.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/22476220345.pdf
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/numusipi.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_off000069bf.bin
4055d47c51db9db9e529284db0ec388b3a37b5b2e9e8f839bbfc25012f65fec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BF 5440 bytes
font_01_sfnt_off00007c3b.bin
6d814e988a142748e5ff8bb84de1cdd891652720e78c76d8428abed0bcc96ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3B 10120 bytes

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