Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa88421409c5757…

MALICIOUS

PDF

40.6 KB Created: 2020-07-31 14:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27edc8bf12c21a48f0a8e9e890ab858c SHA-1: 55391afaf2e698af499e44ae16ef812c65acf7d0 SHA-256: 1fa88421409c5757c5ad156323dc9b98f7290340df56b58ad7a4ccbb40ae3642
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=artificial+intelligence+and+machine+learning+fundamentals+pdf+download. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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.cc/pify?keyword=artificial+intelligence+and+machine+learning+fundamentals+pdf+download
    • http://files.a2saraduvall.com/uploads/1/3/1/8/131856086/9205237.pdf
    • http://files.unklemikesplace.com/uploads/1/3/0/8/130814492/jiresuguwukolebupe.pdf
    • http://files.faustina2.com/uploads/1/3/0/7/130775741/8353447.pdf
    • http://files.mechanicalairconcepts.com/uploads/1/3/1/4/131452950/9614493.pdf
    • http://files.boomboombrazil.com/uploads/1/3/1/1/131163712/fulenif.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/46621201879.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8150/files/tigigixanixujavuxopinu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1676/5088/files/gukajudemedifinaxolej.pdf
    • https://cdn.shopify.com/s/files/1/0440/7050/2550/files/norasinajebazolupif.pdf
    • https://cdn.shopify.com/s/files/1/0434/2104/0792/files/veluwezefivusigor.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/17862917509.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/24060496710.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/bitafopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/puzovir.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/11586897882.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/82057948586.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/58941257921.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/75797265460.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/
    • https://cdn.shopify.com/s/files/1/0432/1676/5088/files/gukajudemedi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ffe.bin
5b6a9068b7ee9107ad6c945fff5da7ed9c7c80f0baaa51cbc89574754e454a1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFE 5532 bytes
font_01_sfnt_off000072aa.bin
5f57803e0f29f197d8bb8b98842a8b04119f508ff5e85d063c031245ad49212a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AA 9960 bytes

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