Malicious PDF — malware analysis report

Static analysis result for SHA-256 312ce135a943d3b5…

MALICIOUS

PDF

37.7 KB Created: 2020-10-16 00:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ea7a4ab3cde1b8b22c56b5b36fe42983 SHA-1: 6e23d11e9364fdceda53085c9d420fdd7520d396 SHA-256: 312ce135a943d3b544539f4c3591fa1386c2ecb92fd0be182e1b5f4db6f9b9f7
224 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a remote-support tool lure heuristic suggests a potential pretext for further compromise, possibly involving social engineering to gain remote access. No scripts were extracted, but the overall structure points to a link-farming or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=tcss+ecology+test+study+guide+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f88bba0d86f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f88b9f4e1369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8730a500f7c.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/porukofosu.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/rodokigilorijuxirix.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/mozojibob-lisad-merodu.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/dinezufujilo-basejugejenug-sutaweb.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nimemoroligamaj-tafixidupara.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/2923045ee.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/3321595.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/mokodet_jumisimo.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/931685.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/c444a24881c061.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/kibafazopebanu.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/xelikanotuzifaja.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/sedomu_tetas_fijenif_malonakafeli.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/1/0502/3943/9032/files/xominoletu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9033/7178/files/social_media_datasets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0933/8275/files/lyrics_to_raise_a_hallelujah_bethel_music.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_off00005747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5747 4916 bytes
SHA-256: c2ebe591855234856f02f8ef514793a46d60924ea5d3538d70ee1b1bb29ced1e
font_01_sfnt_off0000681d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x681D 9724 bytes
SHA-256: 7391c210e3b38164933b4794e5d11ad40776949ac4e5dcb24bd210cc89f72b07