Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca373d393d7a3a1…

MALICIOUS

PDF

39.7 KB Created: 2020-08-21 08:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9893074fe91ab6cf8d03198504240d24 SHA-1: 14313178b7b4f7bedbc56c8eb0d556925fb35f9b SHA-256: 4ca373d393d7a3a10684b8e60c795e90541c91a64e35a2e033c4a794b17d64f6
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely to obscure the malicious redirector. The primary malicious link, https://ttraff.cc/pify?keyword=blur+background+camera+app+for+android, is designed to lure users to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=blur+background+camera+app+for+android
    • http://files.alpinecivicclubboard.com/uploads/1/3/1/3/131379296/9dc70.pdf
    • http://wogewas.lesherinstrumentalmusic.com/uploads/1/3/0/9/130969559/f547776f11573cd.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5922/files/35415295512.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3151/files/45300777755.pdf
    • https://cdn.shopify.com/s/files/1/0438/1753/3597/files/22323962797.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1400/files/bose_qc25_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0450/0425/9492/files/pulse_width_modulation_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0430/0642/7299/files/81819699966.pdf
    • https://cdn.shopify.com/s/files/1/0437/0402/5243/files/bell_bottom_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0458/1510/3654/files/leperafavilidewojazeb.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_off00005cac.bin
443957e3b4ab9c6f2acd6f4855231fd55143bd3978567d0f44829968fd407ad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAC 5548 bytes
font_01_sfnt_off00006f6f.bin
01a279fd7cb1e22b878aecb5b7777b849fb8505a9a27d37563a5756057a6c820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6F 10196 bytes

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