Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a78390db958c4d2…

MALICIOUS

PDF

94.4 KB Created: 2020-10-31 08:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1b047563dcad6e88c371efc727df0d21 SHA-1: 257e1a029e70578c726f5134fc7bac7916964a9f SHA-256: 0a78390db958c4d27a8996de49383c4fbcdb6f122a1e2ada9075f255746d24f3
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent URL, https://cctraff.ru/strik?keyword=call+of+duty+zombies+story+summary, is identified as a malicious redirector. The document's content, though heavily obfuscated, appears to be a lure related to 'Call of Duty zombies story summary' to entice users to click the malicious link. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/strik?keyword=call+of+duty+zombies+story+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f87e9637f8b8.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/74aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f951464daada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5f8d7097e6b76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f8e3578c64bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f8ddc922ab6c.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/cf51824a-6cf2-4656-84d4-c5a77118159f/university_of_south_carolina_womens_basketball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559e74eb-f5d5-4d33-8f71-65d052a5063e/gokimaverojekatuvuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606c1cc1-e605-4380-8277-f7cfb0a00069/legizesasimunanemuwet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6622/6371/files/the_interlopers_story.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3206/4412/files/98959284221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6545/0391/files/ez66_guide_for_travelers_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/vupexiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68cf0f5f-dabf-4e07-bea7-87a0ba358c00/is_gw2_worth_playing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0990/0183/files/guxikutamusezuralomopop.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_off000137d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D0 5248 bytes
SHA-256: 71191208026fa1bda0596de5b403371a1c8058dd2f4d5c57922a6963624b5d3e
font_01_sfnt_off0001499f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499F 10252 bytes
SHA-256: a29018260b89203d8a36bd2bae08f196e8579bcc05f5da12c3da2eb04bb6aa2e

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