Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b06f7731a6a50d…

MALICIOUS

PDF

46.1 KB Created: 2020-08-09 16:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b26d03650182c78fbe881784ef8b5fce SHA-1: 6b30a44ef39430e1130d4a538d158bbc869f7f25 SHA-256: 72b06f7731a6a50d48a2f3a77eb12670f05717430f5ccd2f845b797c12d539e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=abs+at+home+pdf', which is also listed as a malicious redirector. The PDF also contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt.

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=abs+at+home+pdf
    • http://zolalipe.gardenmatix.com/uploads/1/3/1/4/131482962/xokitidabopusi.pdf
    • http://files.daniel-craddock.com/uploads/1/3/1/8/131860553/9364619.pdf
    • http://zowuvofoj.azdoodleranch.com/uploads/1/3/0/7/130738748/zafirizosufupuk.pdf
    • http://files.annakubitz.com/uploads/1/3/1/6/131606743/dikejuto-femoke-gapakebenizax-savifida.pdf
    • http://files.firmfactoryafrica.com/uploads/1/3/0/7/130739348/f7f49708b14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/bekugarizaretupax.pdf
    • https://cdn.shopify.com/s/files/1/0431/2124/6359/files/zotex.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/causative_use_of_have.pdf
    • https://cdn.shopify.com/s/files/1/0431/1865/7697/files/28317199416.pdf
    • https://cdn.shopify.com/s/files/1/0436/4930/2693/files/sebijazaxojeso.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/wapujaguwasotuni.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/wemizovubofavunov.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1671/files/xigomoxewaxobel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3396/8287/files/equivalencias_benzodiacepinas.pdf
    • https://cdn.shopify.com/s/files/1/0450/7641/4616/files/auma_matic_wiring_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9777/files/fesexirufan.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/45946511465.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076fe.bin
bf68d08b4f3553f732cd286c5f645335edbce90d264bc0f514647d40018c45ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FE 5284 bytes
font_01_sfnt_off000088ce.bin
ddfc0e9c42e1b861df43dfdacbe7f2f00f37a696fb8d3592453819bdad540252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88CE 10208 bytes

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