Malicious PDF — malware analysis report

Static analysis result for SHA-256 158f275da01cd07a…

MALICIOUS

PDF

46.6 KB Created: 2020-08-11 06:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0b1eccb0c74035e2c1d0e5fe9bacfd3 SHA-1: 513d3153c188d2dcfe85c62d26f610a2b2af8b16 SHA-256: 158f275da01cd07a6b0117c6ea60caad9a8e36fafec2f3f5d2f594f64cd14f84
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One prominent URL, https://ttraff.cc/pify?keyword=waec+biology+syllabus+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, indicating an attempt to drive traffic to potentially malicious or controlled infrastructure.

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=waec+biology+syllabus+pdf
    • http://files.rceassociates.net/uploads/1/3/1/0/131070867/9900860.pdf
    • http://files.sueannecelebrant.com/uploads/1/3/0/7/130739415/1ebeede915609.pdf
    • http://files.haddingtongarden.com/uploads/1/3/0/7/130739918/104605.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0816/2981/files/64797032986.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/rezorej.pdf
    • https://cdn.shopify.com/s/files/1/0433/4331/5102/files/wixumoropibaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/bizamafegoxagidok.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9586/files/11930883880.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/12476788976.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/rexidafana.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/sosutugelalapufaxugoz.pdf
    • https://cdn.shopify.com/s/files/1/0439/1092/2392/files/forap.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/favabuxewesonegimonuvoj.pdf
    • https://cdn.shopify.com/s/files/1/0444/3452/2279/files/business_mathematics_syllabus.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009047.bin
71f7e3fb3756329d6cff5cf53fae515d63bce37b3eba004d1fa52a96c08e9210		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9047 18788 bytes
font_00_sfnt_off00005b59.bin
232b71ecf4e271ad726bdcda1a2439540ecc8c565eb7653aee722adaf13e120f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B59 5484 bytes
font_01_sfnt_off00006e1b.bin
e20aad57d7718da0166ddacd3bf8c4424b37686dbe68531e648ba8734fe61bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1B 9920 bytes

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