Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa33cd51690b340…

MALICIOUS

PDF

38.9 KB Created: 2020-11-06 11:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 652bd018b7cfe49076de8c8a5725207f SHA-1: bd06fe8082b2129b8fc6ab610fcd2fb0d9482b6f SHA-256: 2fa33cd51690b340b1180158c6d87bc64f17d7cc5548e89da76bf927fe0f9ab1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many pointing to cloud-hosted PDF files. One of these links, https://cctraff.ru/123?keyword=terra+cotta+fragment+lapita+solomon+islands, is identified as a known malicious redirector. The presence of a link farm suggests an attempt to manipulate search results or distribute further malicious content, potentially via spearphishing attachments.

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/123?keyword=terra+cotta+fragment+lapita+solomon+islands In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5f92861475e31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f875f7c1b7ef.pdfIn PDF document text
    • https://razisosip.weebly.com/uploads/1/3/0/7/130739291/polujamumo-nozonizesawutuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xajowu/ximiwobo.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/laura_moretti_nutrition.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/price_pfister_kitchen_faucet_removal.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/electric_chafing_dish_set.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/patch__tweak.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/51608212791.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/41784230322.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/3858688140.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/wegilegakukuvofevatebiju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A6D 5212 bytes
SHA-256: 586dabcbb08a7cdb8dd5c4ea38c613f98911a4cbac0d0f78116b60e7429d82a6
font_01_sfnt_off00005c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0E 11472 bytes
SHA-256: a88526140a0cc17c77bf10902d3aa92cd54d4fa2040d5ddf05937972b84bf1a9
font_02_sfnt_off00008078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8078 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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