Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd5cbd0b0adfea9…

MALICIOUS

PDF

72.1 KB Created: 2020-12-02 01:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 18e223f1736e9329d0a94a0dfec46354 SHA-1: cbdb8bbb3209bba56bd0db209f5112ed9d114dc4 SHA-256: 8fd5cbd0b0adfea9532dfd0a12767240054426ce8718d398c0e378aa6044d8fb
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with the primary one directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Wow classic alchemy guide', suggesting a lure to entice users to click on the malicious links. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?utm_term=wow+classic+alchemy+1-+300+guide In PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/gamebarosafe.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/5a4a8c9a40.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/biberinuloj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5f8ed278b151e.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zikarab.pdfIn PDF document text
    • https://rewuxumo.weebly.com/uploads/1/3/4/5/134586949/e7e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5fb9a5272dc1e.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://static1.squarespace.com/static/5fc1412bcd1e280355d6a3a9/t/5fc362339b1ed035384845bb/1606640179947/el_uso_de_la_h.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d8d024b06a7eb3fedc56/t/5fc158fc2dd96f591821bf81/1606506749419/costco_tent_garage.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7ac403f5353fd956fc5/t/5fc129b5fa04221c714995e8/1606494645137/14785310547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2fcb28-8c28-4ee8-95ad-54ce405b6894/93956950975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135ef143-15de-4417-af5d-148030a9a73f/pixebuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfa8ad0-a49b-41c9-904c-061538d27a13/38461137920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0faa70-f0ce-424b-8424-482fcc4ea63c/72798236484.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_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 5548 bytes
SHA-256: 4914bfc08f7b3db29d3d1759a7d072d34266a7a3e8d2d0564f3b69cfd05a20b6
font_01_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 10596 bytes
SHA-256: 8062bd9e9248ea95cbd422dfa1492b18bccdbab54dc54e161c70c5092ce27920
font_02_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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