Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b35b806ab7cd0c…

MALICIOUS

PDF

66.0 KB Created: 2020-10-06 13:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0c5664ab0d5d960a45d10eba5c9a2342 SHA-1: ed618b5447c108b3b0b850ff789b2b1f90aa2345 SHA-256: 24b35b806ab7cd0c61ea32b0c227385e0dca17b4ed384beb177dc913c9ead2de
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik?keyword=sao+fatal+bullet+assault+build, which is likely the primary malicious payload delivery mechanism. The ML classifier also strongly indicated maliciousness.

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=sao+fatal+bullet+assault+build In PDF document text
    • http://files.takashinagasawa.com/uploads/1/3/2/7/132740914/noxojegotekitip.pdfIn PDF document text
    • http://files.claviere-schiele.com/uploads/1/3/1/4/131410007/ketep-suboxawutodo-zuviburumirage.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8511/4781/files/roll_a_joint_apk_hacked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/5287/0053/files/what_is_proof_of_residency_in_missouri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2722/4986/files/46965955615.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/49463838558.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9530/4608/files/fomon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231486b9-001c-4e0c-ada4-4abb5636b269/16969964568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc6f357-e854-42e8-bcab-aef929e9185c/81239076466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/bella_luna_kitchen_nightmares_yelp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9802/0767/files/7716454215.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3333/3407/files/letter_of_intent_medical_school_binding.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0921/5134/files/restaurant_7_steps_of_service.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/shure_drum_mic_kit_price_india.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a830.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA830 12364 bytes
SHA-256: 74c4c8ddcf092c1615e1bbbc73f6044633d8c0969b66f6421c6d71e3715c71c0
font_00_sfnt_off000096fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96FD 5048 bytes
SHA-256: 07e48480b2fa22584744c65ca6cc846da74e36608139945b245630238c0a5acb
font_02_sfnt_off0000caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 15336 bytes
SHA-256: f4587a7e8b99a86ba4330c06c5fd557aa549c04169f54509dcb6f0e4b45aa910

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