Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da1abe186d0caed…

MALICIOUS

PDF

46.8 KB Created: 2020-10-30 02:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 37aab28821be2459af290225eb2944f8 SHA-1: d210e5d3602339175d94e88be7c7529d3cf427a8 SHA-256: 9da1abe186d0caedc97936d88333c82bceff679df514c3fc0e4594251eff54b5
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=post+free+classified+ads+without+registration+list', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to classified ads and the malicious URL, suggesting a phishing or redirection attempt. The ML classifier also strongly indicated maliciousness.

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://ttraff.ru/pify?keyword=post+free+classified+ads+without+registration+list In PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/monuxijinozopat-xowef.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/wawakajimesim_gubepunelenopo.pdfIn PDF document text
    • https://wojegapemepuwa.weebly.com/uploads/1/3/4/0/134096127/pesuzaxoniwuz.pdfIn PDF document text
    • https://wesodopudo.weebly.com/uploads/1/3/4/2/134234684/rojerut.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/cd019fb0.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/8a81413.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/97c7f1cd-f356-4dbd-a3cf-31d4b0b6f160/97831109181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938b19e5-b2f4-40e1-b7fe-8fce0d3b7c1b/epson_powerlite_6110i_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/phone_number_tracking_software_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/wobinobopixomeromagirisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8631/3151/files/incremental_theory_public_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0c6d13-f6c6-4666-9280-017a2f067b9c/financial_accounting_weygandt_test_b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee257b76-774d-480f-8a48-e32c7a86ac16/alter_ego_5_cahier_d_exercices.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_off00006a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A99 5256 bytes
SHA-256: c3f7b8d4a2d32080f66f246a3ef59378ecabc9f3bc35241910f13a3a91485031
font_01_sfnt_off00007c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7E 10308 bytes
SHA-256: 8ce59a44f687dd7a298ede5dcbe27c238ab96a6b2bac44fa002e054e2529562b
font_02_sfnt_off00009fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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