Malicious PDF — malware analysis report

Static analysis result for SHA-256 44139a9ada12f053…

MALICIOUS

PDF

47.9 KB Created: 2020-09-23 01:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7c3a8e7fc429ff608d0cbbdaa43752f7 SHA-1: 4249db4555f05ca8a9988bacb6c733e7d5b0b9f5 SHA-256: 44139a9ada12f05327aeb149c5b97462c7bf32f422a944174b96c8d2934c8405
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.club/wix?keyword=ap+bio+evolution+study+guide In PDF document text
    • http://pifojo.fishinginnovationsnrv.com/uploads/1/3/1/4/131452836/9e814.pdfIn PDF document text
    • http://tisegadi.2ndcityradio.net/uploads/1/3/1/3/131398368/3705640.pdfIn PDF document text
    • http://sigiruzu.buttonsnmoore.com/uploads/1/3/0/8/130813632/giwibofefi_lofano.pdfIn PDF document text
    • http://files.stmarymagdalenelangridge.com/uploads/1/3/0/7/130738823/lutajepiwinug.pdfIn PDF document text
    • http://mikiniluk.hennanuutinen.com/uploads/1/3/1/0/131070109/b67a3263632b7.pdfIn PDF document text
    • http://files.clintonrotaryct.com/uploads/1/3/2/8/132814989/pimutanuwujebaguki.pdfIn PDF document text
    • http://zawepu.robertodesignhouse.com/uploads/1/3/2/6/132681579/1c9511142.pdfIn PDF document text
    • http://files.heritagepumps.com/uploads/1/3/1/6/131606291/vimavunaz-potaviv.pdfIn PDF document text
    • http://rizepo.aprenderyaonline.com/uploads/1/3/1/1/131163953/gawasikikegujip-zoditibiwetet-medisavakejumi-zigijemas.pdfIn PDF document text
    • http://robixu.herbssupply.com/uploads/1/3/0/8/130874134/nalidi.pdfIn PDF document text
    • http://pawuwez.cantonohiolandscaping.com/uploads/1/3/0/7/130776321/3998718.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/1/0459/7311/0951/files/83541258660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/cours_d_arboriculture_fruitire.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54B2 1684 bytes
SHA-256: 51fdace8bd53b7d2e6af2c0ab3a57c298b99a0f760d42a36c32010743562cd6d
font_01_sfnt_off00005d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D16 5112 bytes
SHA-256: 5ef03ee38644751a8d884e58254fbe35a2ef1a4db201ee9c608f5859e65c4807
font_02_sfnt_off00006e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E92 2044 bytes
SHA-256: 00e9c67b84577ee292276cd5de885299f23f5730b2327ee67451e1a4c0ce668f
font_03_sfnt_off00007811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7811 10428 bytes
SHA-256: f801e48a86342e72a85055fc4b58a6ac5b3e6f3e073654eadbcbeb9155c248b5
font_04_sfnt_off00009bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCC 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f