Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e77827a170f128…

MALICIOUS

PDF

40.7 KB Created: 2020-11-07 15:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 61a61a6668c0f5d0723bb539c81f2a09 SHA-1: e2ff02cb8c99fa7e4cf3a4aef7bff1bb36c8cee8 SHA-256: d1e77827a170f1287bcf8982602da981f1384c62ae6cfec4908bb01e12b53fdc
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting an attempt to lead the user to harmful content. The document body, though heavily obfuscated, contains text related to pranks and includes the malicious URL. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://traffmen.ru/123?keyword=pranks+to+do+on+your+boyfriend+over+the+phone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5f960f51eabb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5f9b33d9be91f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://depobudad.files.wordpress.com/2020/11/lejowidopatoruma.pdfIn PDF document text
    • https://felibule.files.wordpress.com/2020/11/nekiriwupowupakezul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1294d863-106d-4651-95dc-43ec537ce05a/74464119844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc220bc-4c48-46ac-9656-16bdbc2a1b65/74662043697.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/harry_potter_and_the_sorcerers_stone_full_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f82006b-1361-406e-953f-7514dacaabac/87437717405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae85c512-2644-43e7-93d0-46a6dd9dbf00/stardew_valley_having_kids.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8372bb-e6a3-4ec1-95d4-89f9770b4c33/autodesk_revit_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec1e7f4-0bcb-412d-8686-3d6a11a3fe11/vofedudepeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ba1ac4-e9ee-4ee4-98d0-430e9bef02f2/dujenuwapo.pdfIn PDF document text
    • https://vipuvixo.files.wordpress.com/2020/11/xanomuloxasan.pdfIn PDF document text
    • https://dulifegu.files.wordpress.com/2020/11/2005_ford_escape_workshop_manual.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_off0000607d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607D 5464 bytes
SHA-256: 86fb7826bad241544e413481d67a07f722efb66e7659af125324c0b3f72ec9bb
font_01_sfnt_off0000730f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730F 10352 bytes
SHA-256: fffaa7586736dcf531cdb2d729b4400afa09087b6182f0375d2cc0a6b14066a2

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