Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e55b7ea2f0efd7d…

MALICIOUS

PDF

37.3 KB Created: 2020-10-08 08:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7ea715ff8430b4e4207b5c20b812b33a SHA-1: 6593822df7bec2ce89537626736d7859b1a0c1d1 SHA-256: 4e55b7ea2f0efd7d0dab7103ff1eca45d72ce0284888b39d791373838f905cfd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `https://cctraff.ru/strik?keyword=eduardo+garcia+maynes+introduccion+al+estudio+del+derecho`. The document body, though heavily obfuscated, also contains this URL and other Shopify links, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=eduardo+garcia+maynes+introduccion+al+estudio+del+derecho In PDF document text
    • http://lukejep.stlouistennriverpacketco.com/uploads/1/3/0/8/130874104/8122870.pdfIn PDF document text
    • http://files.remembrancestars.com/uploads/1/3/1/6/131636886/160d10e3dd.pdfIn PDF document text
    • http://files.702wi.com/uploads/1/3/1/3/131380969/bc2b5.pdfIn PDF document text
    • http://files.emmave.com/uploads/1/3/1/8/131871864/tilexovugufigar.pdfIn PDF document text
    • http://wobefotol.jongagnoncomedy.com/uploads/1/3/0/7/130776031/8200521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0466/6402/4229/files/analogous_structures_definition_and_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/lopazewufa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/luvutizenetam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5639/7474/files/minecraft_wwe_map_indir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2989/1742/files/weather_corry_pa_5_day_forecast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4417/0649/files/55236548841.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5053/5578/files/gangstar_vegas_cheats_2020_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2169/6149/files/dead_effect_2_hack_mod_apk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4428 5292 bytes
SHA-256: 441df4dbf479175379ac4bc340181555aa2350f768957269a07d49794eb5a347
font_01_sfnt_off000055fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55FD 10464 bytes
SHA-256: 93806b0d8b797ccbeba55278a957e47f94937e9187ebd833d61f1d8fc4df7538
font_02_sfnt_off000077eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77EB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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