Malicious PDF — malware analysis report

Static analysis result for SHA-256 c833c1c70b39ab61…

MALICIOUS

PDF

152.1 KB Created: 2020-10-11 10:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 961eb4b49ae89983f7741e061362f943 SHA-1: dc3a43727c77c705f3fda3e5fad5859761d218b9 SHA-256: c833c1c70b39ab619da746d803b70fe72879a96abeee1ab122ba359bc6f1c1e9
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://ttraff.club/pify?keyword=hearthstone+mage+arena+guide'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the target URL. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ttraff.club/pify?keyword=hearthstone+mage+arena+guide In PDF document text
    • http://files.barskinproducts.com/uploads/1/3/1/4/131438150/4487424.pdfIn PDF document text
    • http://files.myrouteapparel.com/uploads/1/3/0/7/130739251/6425392.pdfIn PDF document text
    • http://files.massanuttenyouthbrassband.org/uploads/1/3/0/9/130969436/pilomulam.pdfIn PDF document text
    • http://files.walthamchangemaker.org/uploads/1/3/1/4/131453114/dopabuzaxajewisexu.pdfIn PDF document text
    • http://files.stmichaelsmaronite.net/uploads/1/3/0/7/130776458/giwurudalijov.pdfIn PDF document text
    • http://files.hiddenfocus.com/uploads/1/3/0/7/130738531/vuduzubazonogomapewo.pdfIn PDF document text
    • http://zawuguna.shurn.com/uploads/1/3/1/6/131637352/12c3702c0e.pdfIn PDF document text
    • http://veseru.mandarin4u-sd.com/uploads/1/3/1/4/131482997/8812791.pdfIn PDF document text
    • http://dokozore.dancedesign.org/uploads/1/3/2/6/132682555/2037503.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/eed70fde-a38c-4f72-9783-6cea99a15690/24930371579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df0f2f7-df7d-4cbf-8d6f-1beb762c911d/tikamej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d220dfce-bd86-403a-a055-e65427dc9042/87971230267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6bd41f7-c551-4e11-8d1d-315e1b687701/bedewolewigaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5392f8f-6d04-4994-b0df-8a8126fabbce/nojabidenazizusimede.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_off0002010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2010D 5052 bytes
SHA-256: 677e7c726168824c950a3a9036dc4174dee0b9416f61c17eeedba5307fe276f6
font_01_sfnt_off00021203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21203 16008 bytes
SHA-256: 53cb6a884b6f2236126d3d25081566f37254bed00eaf6526df72b943b0adcd83
font_02_sfnt_off000242d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x242D0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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