Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dc3020eb0b82f9…

MALICIOUS

PDF

48.6 KB Created: 2020-11-03 20:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4fe027b17f7b1205e2fa96fc8547957b SHA-1: e04f40236e9409c1c1d46d4bdbd690c473cfe89f SHA-256: 82dc3020eb0b82f9417628f8d26b05934c19b64548aced5f9890042eaa83d7fc
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, specifically for linking to known malicious redirectors and hosting a large number of external links on disposable domains. The document body, though partially corrupted, contains URLs that are part of this link farm, suggesting an attempt to drive traffic to malicious sites, potentially for SEO spam or phishing. No scripts were extracted from this sample.

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/aws?keyword=schwinn+870+treadmill+manual In PDF document text
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/4325082.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/a77ec655fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f99f69eb744f.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/942503.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/0450f245c9816c.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/fodevezewipozofidepa.pdfIn PDF document text
    • https://vafumavuforowa.weebly.com/uploads/1/3/4/4/134489815/b0c32c4d8c45a67.pdfIn PDF document text
    • https://dikosunasalimob.weebly.com/uploads/1/3/4/3/134363034/fozagirolebipijapewe.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/8444287.pdfIn PDF document text
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/fokajugadezela_lexefapi_tizov_fegarirug.pdfIn PDF document text
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/62ee556db82.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://uploads.strikinglycdn.com/files/44f6ebbe-2f31-4c88-bd61-62bab843fdbf/98104442551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bdc1fac-c098-4cf6-9bcf-0af81253ad04/tuligupelefapodezineme.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_off00007135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7135 5384 bytes
SHA-256: f08db8a98676cb8f707e3f5233660cf46edea0ea22ce93ff5a8ace0b6394e203
font_01_sfnt_off0000835e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x835E 10652 bytes
SHA-256: ceff6e0421a0b52e9b34885298d07c8dbaee31327e647e4d18e8b9beffa5ea20
font_02_sfnt_off0000a78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA78C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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