Malicious PDF — malware analysis report

Static analysis result for SHA-256 674b7544bc0a3e33…

MALICIOUS

PDF

37.1 KB Created: 2020-10-30 22:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1d5abcec39afc9b2de9f98d8217a1873 SHA-1: 4d751c07c9260c6f0c5d52a9cd96ee40e196b0be SHA-256: 674b7544bc0a3e33531fee1e7410ad61c2091352130f0ddd1ff6872051f62230
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 identified as malicious by a machine learning classifier and exhibits characteristics of a link farm. It contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'https://ggtraff.ru/strik?keyword=possessive+nouns+practice+worksheet'. The document's structure and the high number of external links suggest an attempt to lure users to potentially harmful websites for phishing or malware delivery.

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://ggtraff.ru/strik?keyword=possessive+nouns+practice+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f87eeacac14c.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/5305957.pdfIn PDF document text
    • https://disanelazutiwi.weebly.com/uploads/1/3/4/3/134361230/6f281a13e810adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_5f9c4d690b526.pdfIn PDF document text
    • https://sowosevutab.weebly.com/uploads/1/3/4/3/134311467/6218772.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/dezedukanebulosugov.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/veloledi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/48449740486.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1093/0880/files/fujebafidolezovizozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8924/7399/files/plague_inc_scenario_creator_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/akademia_pana_kleksa_za_darmo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4186/5384/files/30046579642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6852/0131/files/oracle_database_12c_administration_workshop_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/8446/8390/files/82854816819.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52B3 5204 bytes
SHA-256: 74094951dd1ddf63310d9fcf0a18e6dae9a6c0b4322903f63870703b52060fd3
font_01_sfnt_off0000647a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647A 10312 bytes
SHA-256: 0117e752ed1e43c6579b7e9e0a58ac5a62c37498f1bf29991b0a7e87c478e931

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