Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c8a063373639a2…

MALICIOUS

PDF

57.0 KB Created: 2020-11-04 03:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bf2fa9b403407102759dab9dd753a399 SHA-1: 255dff2858d739ad4847286fd99b6ab01b3b2c91 SHA-256: 83c8a063373639a27008bb656c74c62870a33de188931f45bb19f3b233c022ef
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 to manipulate search engine results. One prominent link directs to a known malicious redirector, 'ttraff.cc', which likely serves as a gateway to further malicious content. The document's structure and the presence of numerous external links suggest a phishing or SEO poisoning attack aimed at driving traffic to malicious infrastructure.

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://ttraff.cc/123?keyword=pocket+tanks+2+player+games In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_5fa1664c0d933.pdfIn PDF document text
    • https://fumumakol.weebly.com/uploads/1/3/4/0/134017799/nifew-xepuvix-meworibam-vunetakarosol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_5f8cea0398f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_5f9828199b0cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_5f98cc3ad8daf.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/14b1b386-4296-4185-9f03-b7f663a75e35/tipos_psicolgicos_livro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32c89a27-3050-4a7e-a272-49b08c96a9a1/40597756639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2355bfe5-52ff-4321-8310-fc2a2af3b3e5/xijuvorotalavozube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b39933-f8bb-48cc-bdce-b2fde4463ba7/33955671512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec7600b-a215-4110-bf74-351836a0e078/discovering_statistics_using_r_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa722e98-e83a-4fe7-9390-ee120c3c28fa/69620187974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d45a379-d230-4473-b4b1-ce5dcf9ec96c/summer_waves_elite_pool_16x48_pump_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc5a46c-20d5-41c5-9517-78d611d6e87a/87704656694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ead914-0330-4e35-b79b-28d3aeada709/the_modern_atomic_model_is_called_the.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_off00009f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F26 5552 bytes
SHA-256: 989b315026088e4ab91553895441fe7396f3ef5d6470ff635f7419c3e25590cb
font_01_sfnt_off0000b20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 11008 bytes
SHA-256: 5ea03c2e204e0c47f391007dde8e98d00c5891da534db4344e5b1e84e3f411a9

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