Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a17c5b5bfee61fe…

MALICIOUS

PDF

70.7 KB Created: 2020-12-20 12:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5da13b67a5ded53331f20dbdee0f6723 SHA-1: c03182344b917b1c317be717be1898d401c0eb3a SHA-256: 2a17c5b5bfee61feef64031fb70321274de59a2c74f8e06d100257eddbb60a85
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm. One critical heuristic identified links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded document body appears to be corrupted or non-standard, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=eromanga+sensei+masamune+and+sagiri In PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/poxavejapalejasegim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5f94a187289f4.pdfIn PDF document text
    • https://duzigavejad.weebly.com/uploads/1/3/4/5/134513143/658b5d4f6d96ef.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/fovako-nezujoziniju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_5fa37e3488858.pdfIn PDF document text
    • https://wojozumokibenap.weebly.com/uploads/1/3/4/0/134097994/mimilelozexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_5f92d4e665e2c.pdfIn PDF document text
    • https://lobakazuperowe.weebly.com/uploads/1/3/4/3/134352895/4c7e0110.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/7385284.pdfIn PDF document text
    • https://kotepavugenufe.weebly.com/uploads/1/3/4/5/134592782/09b3dad6.pdfIn PDF document text
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/roganosolew.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/3abf2bd2-2a35-405a-bdf2-197be5378782/goat_simulator_mmo_apk_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/gallery_walk_worksheet.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_off0000cb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 3612 bytes
SHA-256: 67f8599532e4678aacf1f7b59ab3ad9a4c5f9d0f3a96938b892e8651adafa772
font_01_sfnt_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 5072 bytes
SHA-256: 086f8734855a3b02c7784bb8b78230046a24e73605a83f942a90a14e7f22c660
font_02_sfnt_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 9972 bytes
SHA-256: 10f054e90556c382e36490805eee09a7f45ee58f5d2e3e1e7554f5f5048115c2

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