Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da0957034c279bd…

MALICIOUS

PDF

42.0 KB Created: 2020-08-28 00:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97864878bb8cebe9059bed7c0edbafc9 SHA-1: 259c7fb67c01ae9ffd0265c103cbe61a3f31904c SHA-256: 3da0957034c279bdca38fd4d71c23804bbef9fe2686fb1b1d23a942a3efdf895
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, and PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a malicious redirector. The document body text, though partially garbled, contains the phrase 'Libros de historia de mexico' which aligns with the SEO lure. The primary malicious IOC is the redirector URL.

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=libros+de+historia+de+mexico
    • http://memamun.mallahdivinemallah.com/uploads/1/3/2/3/132303027/cef0a2a467dc00e.pdf
    • http://files.infiniteusrocksandjuice.com/uploads/1/3/1/1/131164204/majazejale-vezivedubezufu-bisudabi-sufobabosijo.pdf
    • http://files.ptgtrainingllc.com/uploads/1/3/2/6/132681544/manilodebig.pdf
    • https://cdn.shopify.com/s/files/1/0431/8075/3058/files/940092720.pdf
    • https://cdn.shopify.com/s/files/1/0445/1673/7183/files/43613063454.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/tovexu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/1206884533.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/thailand_visa_on_arrival_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/quadratic_function_standard_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/vupejetozapirenavare.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/64902216203.pdf
    • https://cdn.shopify.com/s/files/1/0434/5361/2199/files/list_of_adjectives_describing_personality.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_off000061d3.bin
cc7aa4d945e5942e1d796f5217d80c421a4d6d067ed127875d0653668fa1eaef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D3 5296 bytes
font_01_sfnt_off000073af.bin
6c7d1006270f5178277152ca2f175392b4fea1fe3070cee722694ac05d5a7eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AF 11856 bytes

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