Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf4181311b0fa04…

MALICIOUS

PDF

43.3 KB Created: 2020-10-07 22:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1d664d7fa57605b4e5e547665c609ba9 SHA-1: b86c79074a6da07b53824f010af4900d6b71266d SHA-256: abf4181311b0fa04595c0d8b631bd8b3486f992d1e94dd43b8efdbc87c3133ef
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially obfuscated, includes a URL that appears to be a lure for users interested in software execution. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which likely leads to a further stage of the attack.

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.club/pify?keyword=how+to+run+project+infinity+without+usb In PDF document text
    • https://site-1048452.mozfiles.com/files/1048452/nubatonemuburorane.pdfIn PDF document text
    • https://site-1043249.mozfiles.com/files/1043249/fozogetafalan.pdfIn PDF document text
    • https://site-1038990.mozfiles.com/files/1038990/97628796886.pdfIn PDF document text
    • https://site-1038744.mozfiles.com/files/1038744/mupuvetiboziwixari.pdfIn PDF document text
    • http://files.ceecentre.com/uploads/1/3/1/3/131379590/6059448.pdfIn PDF document text
    • http://niwetok.camralsolutions.com/uploads/1/3/2/7/132741389/d967e905f89b02.pdfIn PDF document text
    • http://kipid.themjharness.com/uploads/1/3/2/8/132814930/3e410c77dc9.pdfIn PDF document text
    • http://gemixe.olsonimmigration.com/uploads/1/3/1/3/131397997/5f8fcfbb278c940.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/3e05c4f2-4545-4bda-a236-2724351aac75/zalutugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb17660-95ba-490b-b1e8-f2a60a22d00e/zefezurinusudaxepadis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a83f35c-0cac-4543-901d-40bf0f3299c0/77726297317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12af4aa1-fa95-4be8-ab89-b9e6dfa919dd/51559425317.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_off00005f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F80 5112 bytes
SHA-256: d4b6926cddae624a79eecf0b02b16fa0c6a827943e7374ae1429addb13d8eedc
font_01_sfnt_off000070fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70FE 9756 bytes
SHA-256: 980c7afa3bc472891d71cc40e6e591eb26bb913e5978a6cb04ecf99fd96c58f1
font_02_sfnt_off0000925b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x925B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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