Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ddb17df1607b69…

MALICIOUS

PDF

45.9 KB Created: 2020-07-30 03:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f077c378c7e3edea8e89d799b2d0918 SHA-1: b8dd1e2282095d88ee3782f4e09121400f457ea2 SHA-256: b5ddb17df1607b69a070efcf83c4318c0aaadcb370d402ca5fa8a4c631d4b92a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with the primary redirector pointing to a known malicious infrastructure. The ML classifier strongly indicates maliciousness. The presence of a link farm suggests an attempt to lure users to malicious content, possibly for phishing or malware distribution. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=the+palgrave+handbook+of+critical+thinking+in+higher+education+pdf
    • http://files.dansinitiativet.com/uploads/1/3/1/4/131409017/bfcde2730f58799.pdf
    • http://files.oxygenjewelry.com/uploads/1/3/1/0/131070918/4727963.pdf
    • http://files.transitionstechcollege.com/uploads/1/3/0/9/130969966/godiborufumudo.pdf
    • http://files.globaldancearts.org/uploads/1/3/1/4/131407572/3514cb9caee.pdf
    • http://files.insurorsofamerica.com/uploads/1/3/1/4/131437018/8533666.pdf
    • http://files.dansinitiativet.com/up
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5513/files/53017227892.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/21129461191.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/24599203099.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/77638911070.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/rabonoluvaxedisefibove.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5739/files/pisadiri.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/67229865745.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7377/files/72682622260.pdf
    • https://cdn.shopify.com/s/files/1/0434/8801/8594/files/wifozapodexo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/wubipiborudewesurexa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8577/5519/files/18990035511.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074d7.bin
d9abef37ae4fa983807e1d0baa072eacf681e7a6025f3cdbe081f714e8d546ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x74D7 5332 bytes
font_01_sfnt_off000086f2.bin
9e8ba64390a85822307ebcd35ec36f9442b8d06f29de9ba61f719786f0a3f068
pdf-font-stream PDF embedded font (sfnt) at offset 0x86F2 10164 bytes