Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd41ecd64d86c0e7…

MALICIOUS

PDF

36.5 KB Created: 2020-11-04 09:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2dd33245c7bc6ace0f838d1258325bb1 SHA-1: e479beda22bf041792160683cbe7803be463e67e SHA-256: dd41ecd64d86c0e7a067bf6de3c73a0da9c8cadacae4c053fa57532bb28964a3
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 critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URL, https://gettraff.ru/aws?keyword=team+contracting+inc+miami, is the primary indicator of malicious intent, likely serving as a lure to a phishing site or malware download. 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://gettraff.ru/aws?keyword=team+contracting+inc+miami In PDF document text
    • https://jikesekija.weebly.com/uploads/1/3/4/3/134367489/8131998.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/7e627031f88a.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vunud.pdfIn PDF document text
    • https://bewarovawizijus.weebly.com/uploads/1/3/4/4/134454629/2773162.pdfIn PDF document text
    • https://pavaliwakugaban.weebly.com/uploads/1/3/4/3/134373235/vapuxa.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/8145298e.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/195a68bc-af4c-4db9-8a19-b0343c42c16c/paxam.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/87867489103.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/gelatevopumesukijow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/323afd43-3e8a-4e24-bdd6-bd8ff04cc253/story_thieves_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/curb_65_score_pneumonia.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/vocabulary_workshop_level_a_unit_1_synonyms_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/kapadiluj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12680c47-57a1-4736-bf6f-21532597abb0/62111479361.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_off000045d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45D1 4644 bytes
SHA-256: 508dfd807b5a0a4502307fe0351ffbc5e0e6605e68c23d120dcfc6ccac38bdf2
font_01_sfnt_off00005572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5572 9784 bytes
SHA-256: d5b656c111a15547ed6189a1e73646b63a1bed50ac16b8de1d20d2a78796d422
font_02_sfnt_off000076ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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