Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d32cb30a23c0be…

MALICIOUS

PDF

77.9 KB Created: 2020-08-11 22:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e70d8d02805bb10b66b506fb292cad28 SHA-1: 9e9698c4890211546125bd40f1c9f6132c9d2e71 SHA-256: 99d32cb30a23c0be225af2a3386349edfb120168806e09d22ad09f4e042eb3a6
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of this link farm, pointing to a redirector service. This suggests the primary purpose is to lure users to malicious sites.

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=android+arduino+bluetooth+tutorial+pdf
    • http://files.jmechanix.com/uploads/1/3/2/3/132302993/bekudogekarin-jozebaveral-tuwotulevirive.pdf
    • http://fovazago.savinggracearizona.com/uploads/1/3/2/7/132710657/4335214.pdf
    • http://sikug.emmanuelbaptistchurchtn.com/uploads/1/3/0/8/130814328/mebotuliruzogijofaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84302935330.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9351/files/58292707341.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/4818986241.pdf
    • https://cdn.shopify.com/s/files/1/0428/5136/9127/files/48866280450.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/xijojujepo.pdf
    • https://cdn.shopify.com/s/files/1/0447/5614/0186/files/counterparty_credit_risk_management.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/fuvigipilab.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/100_top_active_directory_interview_questions_and_answers_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/mewabotenuvumavalug.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4199/files/xifikunukude.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/31880061209.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_off0000e52a.bin
851963eac56e443a796a20f78e432e8ecd30c7487b445fd46220d9e5105dde54
pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 5080 bytes
font_01_sfnt_off0000f666.bin
64aab1079354f0efac578fcd2a53bb3bc4519aaac97c9200d29836b2fdaa4de6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 16764 bytes