Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c46167e6b2d52e1…

MALICIOUS

PDF

56.6 KB Created: 2020-10-11 09:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 102770cd46a08f661167d055bc2238bd SHA-1: 73eb233b8d7d97936374e47f17683cdb3dd6fe63 SHA-256: 5c46167e6b2d52e1a848f81de6138e37338412e45a61313e3b69cd575a85ddfe
124 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://cctraff.ru/pify?keyword=asignaturas+programadas+uis+barrancabermeja', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure the user to a malicious site.

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://cctraff.ru/pify?keyword=asignaturas+programadas+uis+barrancabermeja In PDF document text
    • https://site-1037828.mozfiles.com/files/1037828/rovutawenitujotekiwuvetig.pdfIn PDF document text
    • https://site-1043562.mozfiles.com/files/1043562/ragidurazegemizibowane.pdfIn PDF document text
    • https://site-1040617.mozfiles.com/files/1040617/98729298454.pdfIn PDF document text
    • https://site-1039382.mozfiles.com/files/1039382/dolegowe.pdfIn PDF document text
    • https://site-1040665.mozfiles.com/files/1040665/vejetofujo.pdfIn PDF document text
    • https://site-1042969.mozfiles.com/files/1042969/zasuraligavumezure.pdfIn PDF document text
    • https://site-1037283.mozfiles.com/files/1037283/19773971819.pdfIn PDF document text
    • http://files.hopskipserve.com/uploads/1/3/0/9/130969298/dipejizuboja_raxijuditu_vafabazimeni_teduloxuguguzu.pdfIn PDF document text
    • http://files.laurelwoodna.org/uploads/1/3/2/6/132695213/1038950.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31b58ba-bdf9-421b-b8f1-5758db1b1de5/sujagebiraka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668b6dbf-9fc2-4657-a5a9-6db552681930/97512991053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc31da44-5da6-4161-a7a9-4d1c28f120ed/49515922204.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_off00009968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9968 5568 bytes
SHA-256: e3ad6c965b5672280d9891322ad2ed66e7effa49b4b1ef7c6679fa6393da6102
font_01_sfnt_off0000ac36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC36 12304 bytes
SHA-256: 708cc8bab40eef03fdfd9b2f51c10b8dd781f390a10a699ffb55c7b6d1cfc044

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