Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1a9f8350219e90…

MALICIOUS

PDF

45.6 KB Created: 2020-11-01 18:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ada84ce70164d9075f8a8dbaa8709132 SHA-1: 36843d93e6bb764609cda3587198f8e29fb76dcc SHA-256: aa1a9f8350219e90f39bf92a3cf4c76af0fd6fa5964089dccdc6556a4a0edbbf
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links and text that mimic a download for 'Valiant Hearts the Great War apk obb'. One of the primary links, 'https://cctraff.ru/aws?keyword=valiant+hearts+the+great+war+apk%252Bobb', is identified as a malicious redirector. This suggests the document is designed to trick users into visiting malicious infrastructure, likely for phishing or to download further malware. The ML classifier strongly supports the malicious nature of this PDF.

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/aws?keyword=valiant+hearts+the+great+war+apk%252Bobb In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_5f989f7255483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_5f933b866285d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f8e51433340a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5f8fb201cfcee.pdfIn PDF document text
    • https://bevugatumuga.weebly.com/uploads/1/3/4/3/134316863/2284679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5f8fb6a5205cd.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://uploads.strikinglycdn.com/files/0127a509-a693-4ef6-9bcb-b1d3db4a266f/24008056752.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0080/2724/files/wofosilapigarevejetojenef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b4011d-a111-4cdf-8ac8-b9371a2e6a45/xataxopajim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57952ff1-5555-49dd-ad9a-46dc6fe0abf5/voripowiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea6b3d5-36e7-4218-94e3-9336ea35501c/97499871319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea5344e-d7c0-436c-a728-28aaa2575e18/catherine_called_birdy_january_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201338b9-d0e6-4707-95d1-59c2c1445f7f/46281070270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9e4efd-c42a-41c6-810a-8269292a06b8/lumipareraforidipijugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72cd52f1-f441-443b-a926-431ae0cf16a5/zamafuluzutifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7513/4130/files/18730100396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceea44a8-a004-4fcd-a27b-3bd1ad5de198/dupont_manual_debate.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_off00005fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE2 5132 bytes
SHA-256: d239aac08a4c52b63e7da2f883c0dbd904a519815ed050970894d6fa405f51a5
font_01_sfnt_off0000714f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x714F 13688 bytes
SHA-256: 07d21a45ec14d6af3cc7c820831e8f935f8d7449174b8956233382f27deeb857
font_02_sfnt_off00009af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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