Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d7ea8b27de452b…

MALICIOUS

PDF

45.9 KB Created: 2020-11-07 21:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3ae945865bfbf38a11aefed57b40e85b SHA-1: 309d203e691aa28b732b414bed917cbc68547675 SHA-256: b4d7ea8b27de452b8d48dbb2b8601672bebd37c751404d0a9fd9b3f86c2c98fe
76 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a malicious URL, identified as a free-download phishing lure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to exploit user interest in game guides to drive traffic to a potentially harmful site. No scripts were extracted, but the presence of embedded URLs and the high ML score suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=mount+and+blade+acok+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420240/normal_5fa467b94438a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f90712e74458.pdfIn PDF document text
    • https://peturenu.weebly.com/uploads/1/3/4/4/134401199/jabibonuwudude.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/170666.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/wodabaxazugiwafab.pdfIn PDF document text
    • https://nobigifawu.weebly.com/uploads/1/3/4/3/134310244/rabiv_sulapejebivemek_jusimurebudef_senikulexavini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_5f98e30f3a188.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/vufupu/3.2_the_gas_laws_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5faf4cfb-e68c-4eda-abec-f95f7d893737/85922648589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff58d995-763e-48e5-ae71-fac2c12fa12b/kanikere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8f86af-9e09-4cef-8833-28e8b668f37c/71733200117.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/jmsolution_water_luminous_golden_cocoon_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/tuveketerodusijup.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/olney_funeral_home_texas.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_off00006b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B54 5040 bytes
SHA-256: ba63bea7a69dc8691a6a293330fa49ab91188d495e5d568e31876415ae48b0d7
font_01_sfnt_off00007c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9C 14536 bytes
SHA-256: 47e48038dd0f4baf6cbec3b0521247074be4ad164c760d5675bc1773737468ea