Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b133df5ae3ec41a…

MALICIOUS

PDF

79.2 KB Created: 2020-07-08 18:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 209f2912c4de08f2ba64e13d8b60bc13 SHA-1: c9a532bf7060ee0ae774db9525bc1fb3e6e0a006 SHA-256: 6b133df5ae3ec41ae3e0dc05cb887335d1f6a9a3f2155d4f7888016ebcc6c232
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains a reference to this redirector URL, suggesting it's a primary component of the malicious activity. 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/wb?keyword=object%20oriented%20programming%20in%20php%20-%20tutorials%20point%20pdf
    • http://files.adelaide-pilates.com/uploads/1/3/0/7/130739761/zijupepojumoviziwese.pdf
    • http://files.solomonbamidele.com/uploads/1/3/1/4/131409709/butidujop.pdf
    • http://files.12monthbeauty.com/uploads/1/3/0/8/130874128/6301925.pdf
    • http://files.millbrookrotarydirectory.com/uploads/1/3/0/7/130775846/d99ea.pdf
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130738814/gibaja_tawix_wododibura_musimetal.pdf
    • http://files.light-sup.com/uploads/1/3/2/6/132681002/lolonegesositub.pdf
    • http://files.breathewithlauren.com/uploads/1/3/1/4/131437351/424db3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pawameno.files.wordpress.com/2020/07/44420495370.pdf
    • https://banaxog.files.wordpress.com/2020/06/zilolazel.pdf
    • https://sexepik.files.wordpress.com/2020/06/89141704820.pdf
    • https://besapav.files.wordpress.com/2020/06/40407355938.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.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_off0000e990.bin
18fad493ddd7c701e71b0d79a1ab0bfe7f9ed5fb5ba3cb18d9048910d0056007
pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 5724 bytes
font_01_sfnt_off0000fcdf.bin
5004cb176930efbdfb95406ee51eca127f4532cdcefdd0bada3e746174b04423
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 16292 bytes