Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f5ae939c6747f6…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 20:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1969bedd312a7fad5061feca9061a85e SHA-1: 200b4807a52f3fbd5fab294b3cd62c4ee87b258b SHA-256: e1f5ae939c6747f60a2107349fe475ebc989e745bb33acb0713fc93231a111ce
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for containing links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=bruckner+test+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many pointing to shopify.com domains. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of embedded links suggests a delivery mechanism for phishing or malware.

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=bruckner+test+pdf
    • http://dejinexim.uchpilf.org/uploads/1/3/1/8/131856476/1435a550bec22.pdf
    • http://zemifibi.azpadu.com/uploads/1/3/1/6/131606349/8601967.pdf
    • http://fonoded.telecollaboration.eu/uploads/1/3/0/9/130969204/muwenun_tabunemetawazi_pobalazomi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8389/files/17265661661.pdf
    • https://cdn.shopify.com/s/files/1/0428/1778/1927/files/rukigetojavufuduzegapot.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/limilapogekew.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2554/files/vipitiluz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/bohemian._rhapsody_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/4872/0789/files/fumobosikade.pdf
    • https://cdn.shopify.com/s/files/1/0431/8517/6736/files/banapovegonoxutupu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/galexavinemadulamab.pdf
    • https://cdn.shopify.com/s/files/1/0435/7410/0127/files/nexazafalag.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0021/files/disajoro.pdf
    • https://cdn.shopify.com/s/files/1/0436/1873/0147/files/radio_broadcasting_script.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/xobazok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063d2.bin
a1cd63f1cd53dbaf0b1f30feae6029be85117189115fd6b07d7f2e2e4fcc9951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D2 4744 bytes
font_01_sfnt_off00007402.bin
e818ca60ca850c85959ac384baee2d66e0ad29dea34e5e5c5f24854656d33167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7402 10608 bytes
font_02_sfnt_off00009810.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9810 4324 bytes

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