Malicious PDF — malware analysis report

Static analysis result for SHA-256 832e8483098aa129…

MALICIOUS

PDF

96.4 KB Created: 2020-11-02 13:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7b4cce1dce429dbb8677d821c90f9df8 SHA-1: e7ad3b856a62646012b3195e8389533ab998ec19 SHA-256: 832e8483098aa1295d348ec6e2420c7452f9acb0e513b71c55131981f0c9cc26
184 Risk Score

Malware Insights

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

The PDF document contains embedded links that are part of a link farm, designed to redirect users to potentially malicious websites. One prominent URL, 'https://ttraff.com/123?keyword=pre-algebra+with+pizzazz+worksheet+answers', is flagged as a malicious redirector. The document's content, though heavily obfuscated, appears to be a lure related to educational worksheets, aiming to trick users into clicking the malicious link.

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.com/123?keyword=pre-algebra+with+pizzazz+worksheet+answers In PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/jitejisovin.pdfIn PDF document text
    • https://fumubesoxumus.weebly.com/uploads/1/3/4/4/134485348/9903489.pdfIn PDF document text
    • https://jubezotezuwu.weebly.com/uploads/1/3/4/4/134476040/mokifumikunegu.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/mozuxuzinoro.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/6287953.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/mexefumo-nazaxomorikaxon-ganebap.pdfIn PDF document text
    • https://sogenaluvejor.weebly.com/uploads/1/3/4/3/134328850/pojoso_dokigajijazalav.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/0b8998a2a0561bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jotizifime/parts_of_a_friendly_letter_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/bojejiro.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/placer_county_inmate_search_by_name.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 3200 bytes
SHA-256: dd569f10d8dfa455148fe8444a695ea902bdd1892ff0fe71b371692f8289a204
font_01_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 5460 bytes
SHA-256: 50e334ae9f1d4aa120f8528dff5ef0b147bd85a5aab0becf4fc90d3cf22dd7e3
font_02_sfnt_off00014b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4E 12108 bytes
SHA-256: bf61f3ad8e3d259deef40182c9fe069adbe7a388974d211464bda2595b47571c

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