Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d400baa369a805…

MALICIOUS

PDF

70.9 KB Created: 2020-12-27 21:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 86e2890b4d7de863fb6a05b62a3c99a9 SHA-1: e1d1530f0fcb69a281127a03fdc84c599dae864d SHA-256: a8d400baa369a805e259b6f269df39929fe9ee165edc0bf0515b688c7342bc56
154 Risk Score

Malware Insights

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

The PDF file contains a link to 'traffmen.ru' which is flagged as a malicious redirector. The embedded URL is presented in a context that suggests it is a download for 'Malwarebytes premium apk 3.7.5.8', indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/123?utm_term=malwarebytes+premium+apk+3.7.5.8 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5fafd15942467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/97203432439.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/21112107280.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/drink_glassware_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2889bf1-6df8-4db7-960f-bac07da824b9/jezofukerigikifadofiguvo.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/1146290581.pdfIn PDF document text
    • https://s3.amazonaws.com/muguroviv/48186534360.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/honda_prelude_engine_swap_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeee73b8-1e0e-4ab6-b248-5ea99f416584/nodulamekajijizuwebalokew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409067d2-4607-45eb-968d-3b33caed1574/dinipenupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e5df8f-8814-4463-95c7-285d0a0a5535/dijugugu.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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 5960 bytes
SHA-256: 228ee61eb0ae302e77e1eef9a180b98009552fb679c67338e5799fb9540d20b6
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 10104 bytes
SHA-256: a30fe18bc9185a681a5c9254fed95b00a207ca6a29db86e8c0a7136a437b9794