Malicious PDF — malware analysis report

Static analysis result for SHA-256 873f52afa4032f6c…

MALICIOUS

PDF

40.8 KB Created: 2020-08-09 10:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d15427e7fe7930362f554e24b646afd2 SHA-1: 60ffd6dfcae3800a0cf07039ac4cc2d533a5e26f SHA-256: 873f52afa4032f6c712bc678c5289fd5a444cc0cb4f5d201bd0b8ea8a83500e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate an attempt to direct users to harmful websites. The ML classifier also flagged this PDF with high confidence, supporting its malicious nature.

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 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.
  • 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.cc/pify?keyword=silverpop+api+documentation+pdf In PDF document text
    • http://files.pennybrittenphotography.com/uploads/1/3/2/6/132682913/doleripifeza-fobuxawasamuxil-bufipate-vorawu.pdfIn PDF document text
    • http://xunim.foreverperfectflowershop.com/uploads/1/3/0/7/130740069/41bf19ec.pdfIn PDF document text
    • http://files.joanflemingpoet.com/uploads/1/3/1/4/131453253/9972586.pdfIn PDF document text
    • http://tagit.virginiabeachwaterpolo.com/uploads/1/3/1/0/131070786/1122780.pdfIn PDF document text
    • http://files.frankiegardiner.com/uploads/1/3/0/8/130814423/xolabewep.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/1/0432/1817/4107/files/didegiwibugelove.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/kolekeriruvebaferab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1610/1793/files/xolozunurigugide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/bmp_to_software.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/13586189624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1657/5383/files/massey_harris_22.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/abc_biology_book_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/galake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9432/6939/files/mowuxivovobazafabuwofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8644/4696/files/hebrew_alphabet_in_english.pdfIn PDF document text
    • https://api.box.com/oauth2/token/RequestIn 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_off00005fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE9 5284 bytes
SHA-256: de97a90eba27a3248ed1f23127bd3b5baf1510205e1b77042ae5a86341f6eba1
font_01_sfnt_off000071da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71DA 10728 bytes
SHA-256: 4c406a5989856a4d671dc83d11d4d5a115e8dea13a9406e841b5aff548cb3438

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