Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0078bb6ae8e18f9…

MALICIOUS

PDF

52.8 KB Created: 2020-10-18 00:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e79b9ed14439fc682a6ceb27c87b596b SHA-1: f0d5295cf5967ed827598a8f6743c1b63129fe48 SHA-256: c0078bb6ae8e18f9abab5ac9cec2678bc5d25882ed4d4eb2af25a06030308bf5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded links that are identified as belonging to a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'cheat app', and the primary malicious URL is associated with a known redirector. The presence of numerous external links, many pointing to PDFs hosted on platforms like strikinglycdn.com, indicates a link farm designed to distribute malicious 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://ggtraff.ru/123?keyword=word+with+friends+cheat+app+for+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f87e6761d0a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f8b5d298102c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f872e7c928ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f8784a77f942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f872aa3f0ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f87f4c96564e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f89128ecb76a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b70bc05-674e-44d8-89b0-397827d8f428/loweked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f377c8-8aea-48af-80d5-ec60ec8b9836/fatanosadipitimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c721b5-c511-43e8-b778-dab3fb0be3bf/94707446634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16310e38-34ff-446a-95ac-36b9c5dc80a0/77897056336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d98e08-ea89-4315-a81f-faf2953981bb/13513754763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c0077d-13c7-4a2d-b033-0bc782aaa3fb/dosabigematibigitijoretab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4780/3287/files/55250047978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/gods_word_is_medicine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/sadikexepifiveri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1816/5146/files/84675170397.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/spanish_ar_verbs_preterite_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC8 5316 bytes
SHA-256: ec2f7ab3f36345cc90795e8f390ca213252ffe3145d2933cabb72c86046a98a5
font_01_sfnt_off00009ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF5 10924 bytes
SHA-256: 9709b384ee8a85d466c235e4047f5100aa93aea2d347440a0c0868597beb2c71

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