Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a42b7eb6743b67…

MALICIOUS

PDF

45.3 KB Created: 2020-08-04 11:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54c509d7284c25adfddfbd5419637e9b SHA-1: 1fd1f3f2e32c00d5f384578d60583b232bca8914 SHA-256: 38a42b7eb6743b67242a5173c8bb62df6c4b442ef9306207e43d70e4f03d28d3
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to reading comprehension PDFs and a URL that appears to be part of the redirection chain. The presence of multiple external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=reading+comprehension+for+adults+intermediate+pdf
    • http://files.suearchibaldart.com/uploads/1/3/0/7/130775448/54aced9efb54.pdf
    • http://files.valnettoyage-sarl.ch/uploads/1/3/2/6/132681824/11a4be.pdf
    • http://files.joenorrellart.com/uploads/1/3/1/4/131453248/2102519.pdf
    • http://files.shorklabradors.com/uploads/1/3/0/8/130814043/dokeja.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/bodhisattva_ideal_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4542/files/xijalomogebajoxaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/bakesexotuba.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6042/files/react_native_zoom_in_animation.pdf
    • https://cdn.shopify.com/s/files/1/0435/3871/0696/files/34510531462.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/lefimuropifefuxozuxel.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/50051627954.pdf
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/sexowazom.pdf
    • https://cdn.shopify.com/s/files/1/0435/4985/1811/files/zakevafotuletopitomaja.pdf
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/13565487927.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_off00007150.bin
27953b6d5410667370603c61af9ea7c10c2cae356ec3c2fd134b246362be4dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7150 5576 bytes
font_01_sfnt_off00008427.bin
ca90f2dbb959d578b51832b4e1b1ba7ed88d6488b3599613f822385c2ac15908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8427 10604 bytes

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