Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28c498e7a6624df…

MALICIOUS

PDF

50.0 KB Created: 2020-10-09 00:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f8d1dcf9b9f9b0a3952a62654b14fa00 SHA-1: fd357b144dc6b24cf22d739ba543b8c88a4c7a98 SHA-256: f28c498e7a6624df30523215bdb9cbb7fe019cbbef10bf313a5116ac684eb531
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to other PDF files, indicating a link farm. One of these links, 'https://ttraff.link/pify?keyword=original+left+for+dead+characters', is identified as pointing to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern observed is the use of a malicious document to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ttraff.link/pify?keyword=original+left+for+dead+characters In PDF document text
    • http://files.uottawaequestrian.com/uploads/1/3/0/8/130873876/5936103.pdfIn PDF document text
    • http://files.handsonhexham.co.uk/uploads/1/3/1/3/131379217/legil.pdfIn PDF document text
    • http://lubimus.skeinminder.com/uploads/1/3/0/7/130776167/80891225cc.pdfIn PDF document text
    • http://files.paharidgefriesians.com/uploads/1/3/1/4/131437410/pugesakeravaz.pdfIn PDF document text
    • https://site-1038517.mozfiles.com/files/1038517/23660393798.pdfIn PDF document text
    • https://site-1037124.mozfiles.com/files/1037124/vopavuxitivuxa.pdfIn PDF document text
    • https://site-1037189.mozfiles.com/files/1037189/nilulijoxonimutubajoga.pdfIn PDF document text
    • https://site-1036748.mozfiles.com/files/1036748/72754973218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/wendy_nutritional_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8131/1426/files/the_vampire_diaries_season_2_episode_23_bg_audio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2228/2663/files/5th_grade_social_studies_unit_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/099b8b38-dc09-42d7-903e-71900c203626/63248333223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7441b6b-79e8-4dc3-8e4d-11abfa53d398/garolaserododidem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/641911b1-ec91-40f6-b0b8-c4c4c7f023d5/fabajiwage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1483100e-d9cf-43fe-a42d-3ecf11144960/53715811189.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_off000082b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B1 5308 bytes
SHA-256: 13d513b1f968ff8eaf5933ef394eaeb15e5bc531cfa8caf0c7cff463f5787798
font_01_sfnt_off000094b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B9 11524 bytes
SHA-256: 84d8cce11e271bc001eb1278414b35a268fad4afbd9b850d4687c3e934f058c8

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