Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8f7c4602085045…

MALICIOUS

PDF

49.8 KB Created: 2020-10-09 04:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7f050764768cf408a3a1d51315d86907 SHA-1: 3349893405e964ee065290ceb36b602204ec6813 SHA-256: 7e8f7c4602085045e027e43e8b6ac6bca96beaa77c2940dc8c165ce1d18f5033
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches one of the extracted malicious links, suggesting an attempt to lure the user to a compromised site.

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 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://ggtraff.ru/strik?keyword=ejercicios+numeros+primos+y+compuestos+5+primaria+pdf In PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/70836652123.pdfIn PDF document text
    • https://site-1039535.mozfiles.com/files/1039535/21542060341.pdfIn PDF document text
    • https://site-1044416.mozfiles.com/files/1044416/13915534797.pdfIn PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/welekuxisotorisikab.pdfIn PDF document text
    • https://site-1042547.mozfiles.com/files/1042547/22062740032.pdfIn PDF document text
    • https://site-1043941.mozfiles.com/files/1043941/64233506482.pdfIn PDF document text
    • https://site-1043153.mozfiles.com/files/1043153/kolunemin.pdfIn PDF document text
    • https://site-1036945.mozfiles.com/files/1036945/togokoruvejuvuwewuvekuk.pdfIn PDF document text
    • https://site-1039149.mozfiles.com/files/1039149/fademebobesazurunoron.pdfIn PDF document text
    • https://site-1040092.mozfiles.com/files/1040092/kibabi.pdfIn PDF document text
    • https://site-1038682.mozfiles.com/files/1038682/fipokunam.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/84040760084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6825/8469/files/wumar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/31651127637.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8766/1730/files/82781495264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/3628/7391/files/5838173219.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC5 5528 bytes
SHA-256: ddfd749192aa112f833c1c2b393fc4b9546a7bfb7c845520e3f16ecfa01a8345
font_01_sfnt_off00007d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D90 10960 bytes
SHA-256: 194eac01ab6c3193c5f85859152b6500372be92807d0f325952be8760ffd274b
font_02_sfnt_off0000a1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A1 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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