Malicious PDF — malware analysis report

Static analysis result for SHA-256 50590bc26351d11d…

MALICIOUS

PDF

40.7 KB Created: 2020-08-23 17:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd006fbabf73b82725cbc6dd83f19ca7 SHA-1: 60aff7114faf41d3971757758dae49bbef940756 SHA-256: 50590bc26351d11dffc37b648db9cd69b18c4d1bf496abd7c47ce4da48366452
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru), and another flagged it as a PDF link farm. The document body, though heavily obfuscated, also contains the URL https://ttraff.ru/pify?keyword=azurescens+grow+guide, suggesting a lure to a malicious site. The primary attack pattern appears to be a link farm designed to redirect users to potentially harmful content.

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=azurescens+grow+guide
    • http://files.stjames114.org/uploads/1/3/1/4/131453432/5781496.pdf
    • http://jubobo.thestudentcentre.net/uploads/1/3/1/3/131381369/nuzevorulusifise.pdf
    • http://vivopo.thepolkcountynews.org/uploads/1/3/2/3/132303382/wunusoxivi.pdf
    • http://jomimim.fwpmun.org/uploads/1/3/0/8/130814238/a45a7.pdf
    • http://www.psilosophy.info/inaxivhvbrgtachqc
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/tebidudewamajamewaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9890/files/31860695399.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/calendario_escolar_cantabria_2019-_20.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/57956533670.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/86056140252.pdf
    • https://cdn.shopify.com/s/files/1/0432/7296/2203/files/19254242735.pdf
    • https://cdn.shopify.com/s/files/1/0462/9531/8689/files/86898195651.pdf
    • https://cdn.shopify.com/s/files/1/0436/3668/7008/files/44281335302.pdf
    • https://cdn.shopify.com/s/files/1/0435/5712/6295/files/livejiluletaguvemis.pdf
    • https://cdn.shopify.com/s/files/1/0436/6021/4425/files/paulo_coelho_hippie_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/rupedizivosi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2988/8161/files/medicare_benefit_policy_manual.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_off0000622f.bin
ed493a35edebff936c366ea128db24790002c38f42499c4412aef173dad640c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622F 4996 bytes
font_01_sfnt_off00007354.bin
844aad4ad457df0251d95c842d1f18ad477487ffbb5ce33b5c516a29d5132492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7354 10156 bytes

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