Malicious PDF — malware analysis report

Static analysis result for SHA-256 1955ec125b228f0b…

MALICIOUS

PDF

83.5 KB Created: 2020-11-21 01:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a013087ba2e540533765c27539693469 SHA-1: 55f64213c5c6b222b79a7142608a4eccfa315480 SHA-256: 1955ec125b228f0b4474303299b19026f36e5d609d9af3cd7b4b1ea2f603bbbc
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. The document body, though heavily obfuscated, suggests a lure related to 'Crusader Kings 2'. The primary intent appears to be directing users to potentially harmful websites through a deceptive pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=crusader+kings+2+guide+beginners In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f9c93b11165d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_5fae0a824d307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_5f96682760347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f8a56843aace.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/7909875.pdfIn PDF document text
    • https://vagonegasix.weebly.com/uploads/1/3/1/4/131482995/gatedubibedodapakimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5f9cf30c00308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_5fab3b3fef4d3.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/c0189cf7-e22f-409c-a475-461876572788/96871553580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc4c1b8-9138-4865-81df-c7ff6d1e1491/kelem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4749df-11ac-420f-a1c1-e7cc41ffb532/wegupulowowosovabase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5a80cd-1b85-4864-a018-568833cdb16a/tarzan_lord_of_the_apes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8f31a8-523a-4d71-803a-e5a835357e45/play_services_apk_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 5200 bytes
SHA-256: 0553aa0b8f2624af1d6a39129284b93ad9944fc6efe838602223f0059897278a
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 11060 bytes
SHA-256: bcea9f31b6045f989282ed0300ca1aa80d01c73465fc1b32d0c5358e38e7fd09
font_02_sfnt_off00012c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C51 16072 bytes
SHA-256: bf4ab31430389bf485bb31cdb084220213cce32017bc6689ef711d4e78092607

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