Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a1fced1c506943…

MALICIOUS

PDF

43.6 KB Created: 2020-08-04 05:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef5f0b21c03ce785626185ebd5b9ab2a SHA-1: f7f43e7e908f94db07bf31914bc90bac8828e7a2 SHA-256: 86a1fced1c50694301e7147e0e68990cdebed4722de473e34ee7cf2c81ab59aa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to a book title and the redirector URL, suggesting a lure for SEO poisoning or phishing. The ML classifier strongly flagged this PDF as malicious.

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=marriott+s+practical+electrocardiography+13th+edition+pdf
    • http://files.justforyouspa.com/uploads/1/3/0/7/130740323/e5ea9d460d.pdf
    • http://files.theultimatecruiser.com/uploads/1/3/1/4/131437362/1045534.pdf
    • http://files.ahorsestoryallaboutpieanoldbrownhorse.com/uploads/1/3/0/7/130740242/tojid.pdf
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/tofolag.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5317/files/82702767279.pdf
    • https://cdn.shopify.com/s/files/1/0433/4570/7166/files/81718899245.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5516/files/nawupir.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/94275574761.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96626323422.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7612/files/buvojuloluvapubedopimiw.pdf
    • https://cdn.shopify.com/s/files/1/0439/8612/4958/files/zaniworimegozarezoxemaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/23499543815.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/38040493895.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/27934299260.pdf
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/moginefizuzedu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/36223970368.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/kofapasabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/pokemon_emerald_guide_book.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_off00006b01.bin
3ea205764db5cd8b1ed2353ffab5efc7ac4bef509fa83678f4bb5e5c70ee8510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B01 5740 bytes
font_01_sfnt_off00007ea3.bin
87bc89c35021ae8d6c732ad7d92d43ede6b8b515296e4757aa4ea537a8c28f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA3 10120 bytes

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