Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33b9e434236fcb7…

MALICIOUS

PDF

46.0 KB Created: 2020-08-09 17:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 194d1ed165c664a25f6319e89417d412 SHA-1: 73f633d92578476f2d63549032286fbab52ae825 SHA-256: f33b9e434236fcb754376c4e064faffa8d888fd25022d03eede88e3ce11cb98f
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially garbled, includes text related to joining PDF files and mentions the wkhtmltopdf tool, suggesting a lure to disguise malicious activity. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=joindre+plusieurs+fichiers+pdf+en+un+seul
    • http://files.rueckkehrzentrenschliessen.org/uploads/1/3/0/7/130739393/wesiguxan-saxanopirupox.pdf
    • http://files.uusantafe.org/uploads/1/3/1/3/131379590/9431122.pdf
    • http://files.littlefollowersdaycare.com/uploads/1/3/1/8/131871852/kazewino_povuwolegami_roxosaka.pdf
    • http://files.kelbryfashions.com/uploads/1/3/0/7/130738892/5487628.pdf
    • http://lazuxuvaw.motiv8ed2bfit.com/uploads/1/3/0/8/130874330/nukiwazoz.pdf
    • https://cdn.shop
    • https://cdn.shopify.com/s/files/1/0432/7938/4731/files/vekasutulejikizavikuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9680354999.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0729/files/sovukojireroluboranuside.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/29224131202.pdf
    • https://cdn.shopify.com/s/files/1/0428/2823/4908/files/rusoparusukotile.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/cod_waw_mod_menu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/nurobapisiri.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/12544954714.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/antibiotics_list_with_their_uses.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/driver_power_state_failure_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/minecraft_walls_server_pe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60561448525.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/oblicza_geografii_atmosfera_sprawdzian.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074db.bin
35c8f395afbfd0d30d834a92cf6c76ebb9adf10a27cac2d2da05b55ebdb165b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DB 5024 bytes
font_01_sfnt_off000085ef.bin
fd36a7c3e447f1e87244c1044bd53a53b6add43c9393f8306cad2a04ee2a14e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85EF 11668 bytes

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