Malicious PDF — malware analysis report

Static analysis result for SHA-256 810bf3748edc82ee…

MALICIOUS

PDF

56.1 KB Created: 2020-08-16 17:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52665e1f8b88e2765f006548b44d4495 SHA-1: 52d7ee98a527bf7b97680c0a618ed17bd9f375c1 SHA-256: 810bf3748edc82ee396a5f7736ffda8e304f5cb51743e91031b62747053b09ae
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=kaththi+audio+songs++tamil', suggesting a lure to entice users to click on malicious links. The presence of a malicious redirector and a large number of external links indicates an attempt to distribute further malicious content or engage in SEO spam.

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.com/pify?keyword=kaththi+audio+songs++tamil
    • http://fesorugal.fiduciaryduty21.org/uploads/1/3/1/4/131453096/3795095.pdf
    • http://files.ho-cheung.com/uploads/1/3/1/4/131453484/39af06189.pdf
    • http://files.kathleenritzart.com/uploads/1/3/1/3/131398333/69776ba7df984.pdf
    • http://files.pitkinseniors.com/uploads/1/3/1/3/131384424/2911952.pdf
    • http://files.bluegoosequilts.com/uploads/1/3/1/4/131407102/3039571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/9096/0799/files/71327650571.pdf
    • https://cdn.shopify.com/s/files/1/0429/2952/0796/files/73509060089.pdf
    • https://cdn.shopify.com/s/files/1/0455/7878/0837/files/bicentenario_de_la_independencia_de_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65545430121.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/39544904186.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/fowimimijasutowimu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37144816260.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3257/files/57676265976.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000850c.bin
ef814c176a8f1da23c8531cc5c2cf7ff0cee1f476b4484797f61a686c08539e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x850C 4876 bytes
font_01_sfnt_off00009569.bin
66b7d9b805bd31ad8da4da77968fcd822f44380ed6090eece0283e39d3c4d1c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9569 15788 bytes
font_02_sfnt_off0000c60f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC60F 4324 bytes

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