Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa36c693fa4e871…

MALICIOUS

PDF

58.9 KB Created: 2020-11-04 15:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3e4f32d90784f9d665b0ec489b2469fd SHA-1: d93920e0c7c5b89f3fe148c99391a3478c70fa11 SHA-256: 4aa36c693fa4e871c6e161a4aa43b13d2c3a97aaf78ee396120c3e7a98d9d078
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=bleach+brave+souls+game+guardian+hacks In PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/vilawedalote.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/lularelo-zibato-bofolotexu.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/dozetirog_wuruzesizezuzu_pufiwivi_litivufej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5f99ca639d471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f8fb45bca095.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/5414630fdb3e955.pdfIn PDF document text
    • https://fevijalefo.weebly.com/uploads/1/3/4/3/134383315/630f16e01c626a.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/3d389aa5.pdfIn PDF document text
    • https://velizixevapejaj.weebly.com/uploads/1/3/4/3/134376636/tovakolonotalunosaga.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/wigaz.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/namigemiwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/c782944c-5b2a-4df0-8bd6-04f4ea277243/87451742968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3969a2-b683-4684-9e1f-9266dba5ee0c/madden_16_coin_generator_legit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26b97cb-feda-4856-aa35-49c31fa4225a/6998593624.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7474 5668 bytes
SHA-256: b0260c1e97596aca93b9192f279c7bd38bff4cfd181f0d3543b87a497ead3f77
font_01_sfnt_off00008791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8791 17704 bytes
SHA-256: f79b482e8c0dead939ee6653a26557764c33c3f35bb4cda3e04af640525b1a27
font_02_sfnt_off0000b634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB634 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off0000cb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 4960 bytes
SHA-256: eda8f58f3abc2c0dbc8687b248c9eaf48462e6255d257cffdf9d9fc57937c340

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