Malicious PDF — malware analysis report

Static analysis result for SHA-256 631daa96a8c706f0…

MALICIOUS

PDF

52.8 KB Created: 2020-08-24 09:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2ece061041543dce0542df7ad8a7ba1 SHA-1: e29cc830ffa63aa452fbcbb0e2bc1e240ed9e0af SHA-256: 631daa96a8c706f0359b6de8994153d7e3bc87528b39667399ef12e22be41f55
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL pointing to a redirector service that is likely used to funnel victims to malicious sites. The presence of many external links suggests an attempt at SEO poisoning or a link farm.

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=joomla+3+templates+free+mobile
    • http://nebof.autotrickler.com/uploads/1/3/1/4/131408017/8655288.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/dewazox.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/jogimalez.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/brother_serger_1034d_manual.pdf
    • https://cdn.shopify.com/s/files/1/0441/3951/1960/files/gavegededawelatuvegone.pdf
    • https://cdn.shopify.com/s/files/1/0433/7693/5068/files/camino_island_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/2289/8584/files/18361371738.pdf
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/68850503314.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8683/files/8357920913.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2268/files/63719349985.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/80414092227.pdf
    • https://cdn.shopify.com/s/files/1/0433/5543/9263/files/sudivakotepupaxuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/5977035843.pdf
    • https://cdn.shopify.com/s/files/1/0439/4080/6811/files/punowabis.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_off00009095.bin
310fc5942d92329a05973106397c052c9c1056f93fee0a3808ef429df1b985ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x9095 5340 bytes
font_01_sfnt_off0000a2a7.bin
b7aa9a018058326ac45a0a667d0b2d55c23d04a0a6fa353d690f93f9dd78607e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A7 10360 bytes