Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b68fb8e2b9ca24…

MALICIOUS

PDF

95.7 KB Created: 2020-07-30 12:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60b9b23e6e2c5c19d1d03cddb32bd0cf SHA-1: 393efd987d26fbfd40be1422a6343a9502270109 SHA-256: 66b68fb8e2b9ca24e8e3182182f8ecbecb2aff90b2259ce33b822e49dd12fefb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'pathogenesis of diarrhea pdf'. The presence of many external PDF links, including those hosted on Shopify, indicates a potential link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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=pathogenesis+of+diarrhea+pdf
    • http://files.snowleadershipgroup.com/uploads/1/3/1/8/131871488/pizuvemabedufi.pdf
    • http://files.peggytidwell.com/uploads/1/3/0/7/130776015/geloxe-wiwepi.pdf
    • http://files.rockswcd.org/uploads/1/3/2/8/132816096/jesoji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/26215278233.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/57404064506.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/88279595608.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/58809435751.pdf
    • https://cdn.shopify.com/s/files/1/0433/7529/6670/files/pabak.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/benenarere.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72438278193.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/38363815997.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kitona.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/nubufevug.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/89740638662.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6933/files/voburemujomutepomodu.pdf
    • https://cdn.shopify.com/s/files/1/0436/6509/6857/files/78274765356.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3507/files/favedu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0559/files/42050532525.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_off00013687.bin
0d8fa27a7847b09633309f8757f76442a02f3712cd1cc1603006a2e7083a2549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13687 5060 bytes
font_01_sfnt_off000147b0.bin
7a110577a5cb0dd84b73cc2dcfa05a2b66ab3907c3eb3c3019193af5d3899311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147B0 12836 bytes

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