Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb9107358ad4b1a…

MALICIOUS

PDF

40.5 KB Created: 2020-10-07 18:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3c5d48cc59bd64df77420a1a6b87f771 SHA-1: 60e48957a9a4519d8b15e7dc833b9a0a2efa1048 SHA-256: 4bb9107358ad4b1aef63e2b8eb69d6f5dc0efe5007ed59b434c54a2e979ecc61
224 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs hosted on disposable domains or link farms, indicating a likely SEO manipulation or malware distribution scheme. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.link/pify?keyword=the+bold+italic, which likely serves as a gateway to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.link/pify?keyword=the+bold+italic In PDF document text
    • https://site-1043545.mozfiles.com/files/1043545/tatota.pdfIn PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/36655665212.pdfIn PDF document text
    • https://site-1038530.mozfiles.com/files/1038530/8363585119.pdfIn PDF document text
    • http://files.fitzpatrickecologicalconsulting.com/uploads/1/3/1/0/131069824/momililobunuse.pdfIn PDF document text
    • http://jelugate.donmanchaiii.com/uploads/1/3/2/8/132814930/bibenu.pdfIn PDF document text
    • http://files.ayrcc.org/uploads/1/3/1/8/131856844/roxaj.pdfIn PDF document text
    • http://files.frankish.co.nz/uploads/1/3/0/7/130739256/vamow_xabip.pdfIn PDF document text
    • http://files.seatrunks.com/uploads/1/3/0/8/130814209/foben_gepezaledujig.pdfIn PDF document text
    • https://site-1038995.mozfiles.com/files/1038995/30136637437.pdfIn PDF document text
    • https://site-1040034.mozfiles.com/files/1040034/46060922086.pdfIn PDF document text
    • https://site-1036921.mozfiles.com/files/1036921/repevujako.pdfIn PDF document text
    • https://site-1043451.mozfiles.com/files/1043451/55160907994.pdfIn PDF document text
    • http://files.ericsreyes.com/uploads/1/3/0/7/130775244/wadivabaridif-pimevobedola-mugafakakojata-tajegal.pdfIn PDF document text
    • http://wiwij.panoramiccave.com/uploads/1/3/1/8/131856801/nojakoxuwi_kelowasaw_vozudu_dasavedujinu.pdfIn PDF document text
    • http://vakud.bearheartbottomsetc.com/uploads/1/3/0/7/130775878/5500880.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000628c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 4844 bytes
SHA-256: db76be9c19d9822b06e98e28f7f751d07965e1f8d8fc7dffe1b3af246e9aebd0
font_01_sfnt_off000072f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72F8 10144 bytes
SHA-256: 04604c26e35a1ac681a700042bb880a11743d6c54fa0b09fa92c57dff3849fd9

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