Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c93a1814509c71…

MALICIOUS

PDF

34.6 KB Created: 2020-08-02 14:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0813316603adaf6991146be3d5edd87 SHA-1: f1185e69e1480df544925ea5b915bdb949f5468a SHA-256: 55c93a1814509c7146faa65f2620bd418bd684f2a53778e95b0d003e6d045178
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating a phishing or scam attempt. The primary malicious URL is https://ttraff.ru/pify?keyword=the+believer%2527+s+authority+study+guide+pdf, which likely leads to further malicious content. The document body, though heavily obfuscated, contains references to the study guide and the malicious URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

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=the+believer%2527+s+authority+study+guide+pdf
    • http://files.kilmerlibrary.org/uploads/1/3/1/6/131606630/wizedipatukakerepok.pdf
    • http://files.oceaniacarving.com/uploads/1/3/1/0/131070294/dfa27b8739b436.pdf
    • http://files.empressanjahlapromotions.com/uploads/1/3/0/8/130874278/6189276.pdf
    • https://cdn.shopify.com/s/files/1/0436/3393/4496/files/84305021797.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0432/1070/3010/files/fire_emoji_copy_and_paste.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/18518638070.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0759/files/21169574904.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/12233947060.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/tititakudos.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/37372406047.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/tumatajitotaxarotirap.pdf
    • https://cdn.shopify.com/s/files/1/0434/1543/7468/files/godesap.pdf
    • https://cdn.shopify.com/s/files/1/0430/9899/6889/files/93082267362.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_off0000464b.bin
f565eb92cf54e631bc059f0067658605eba18fcc4ff92cd4846f3a61af33d344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x464B 5588 bytes
font_01_sfnt_off00005954.bin
c29f113ce39b9bdf186e818816489b21e5699245356567370e386a582d073eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5954 10104 bytes

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