Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cd37d428da404f…

MALICIOUS

PDF

73.8 KB Created: 2020-11-01 15:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e4bf3a169af2ec72d18dfa4bc07d76ee SHA-1: 82dbad7b3b55f8c91874ef0d0ea871a813d62bed SHA-256: 28cd37d428da404fe90c6ecefba62a19af7ba66f6d878405eb4eb1d2d59b58a1
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to a play and includes the malicious URL. This suggests the file is designed to redirect users to malicious infrastructure, likely for phishing or to download further payloads.

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 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://gettraff.ru/123?keyword=the+curious+incident+play+pdf In PDF document text
    • https://kajurizekevebok.weebly.com/uploads/1/3/4/5/134586758/9334173.pdfIn PDF document text
    • https://kajukuka.weebly.com/uploads/1/3/4/3/134307777/f861faa5fa7380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f89faf4b07d1.pdfIn PDF document text
    • https://jugubiwujivivej.weebly.com/uploads/1/3/4/3/134352954/surisulese_fapunewaw_kovejaxebufaf_dutaminonix.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/dosimuzep.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/vamezo_zutagijanil_xobenejav.pdfIn PDF document text
    • https://giginepa.weebly.com/uploads/1/3/4/3/134389182/b8138.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/8681431.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://cdn.shopify.com/s/files/1/0493/3615/6319/files/root_cutting_propagation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1140/7524/files/vag_valves_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/diwixazobelonax.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/50443800325.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA0 11092 bytes
SHA-256: a63b6f5d6be544d5e4e228565c692acedfe2ee0376c2f600df02340f263a7ac5
font_01_sfnt_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 5176 bytes
SHA-256: 140d5a3700584a258b87b760015574fb687757438898b9ad167181b970e27824
font_02_sfnt_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 11940 bytes
SHA-256: b41326f3f1c438eb515f6d065f016586b2565fa68f5ea1284e0da60422c9a71c
font_03_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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