Malicious PDF — malware analysis report

Static analysis result for SHA-256 f836e18ca65ee89f…

MALICIOUS

PDF

43.9 KB Created: 2020-11-02 19:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: db6d4ad34ff156ae26b30eac172039a4 SHA-1: 59e9536ca54626475fe33408e46f3ba385959f27 SHA-256: f836e18ca65ee89f22379577218ca2703ccedd0d78ee24310adffe857996ca9b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm designed to redirect users to potentially malicious websites, such as 'ggtraff.ru'. This behavior is indicative of SEO manipulation or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its harmful intent.

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=walmart+stock+prices+today+usd In PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/dalobefafikulil_juxipogoxif_zabupijuke_ramutara.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/492ac7260b2.pdfIn PDF document text
    • https://pibazafefudo.weebly.com/uploads/1/3/0/7/130776509/af108.pdfIn PDF document text
    • https://bovaromekefa.weebly.com/uploads/1/3/4/4/134403346/mumumarovinutibamo.pdfIn PDF document text
    • https://zelidewa.weebly.com/uploads/1/3/4/3/134371532/f443d3.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/3406911.pdfIn 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/1/0502/8901/7028/files/pokemon_3d_android_games_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4ce82a-dbf9-4334-ac9f-b8715f23edd3/18052741941.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/blank_baseball_caps_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/edema_pulmonar_tratamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/pedagogy_books_in_urdu_free_download.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_off00006b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B10 5400 bytes
SHA-256: a4b46be0c33e66c299613a3ffbf5a0220835f24f4d71bd5e826a90d39a8859b8
font_01_sfnt_off00007d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6D 10928 bytes
SHA-256: f8cd0fd99e291df938d799b05a59c7a50052fd08f0d98140a8f44f3785da419b

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