Malicious PDF — malware analysis report

Static analysis result for SHA-256 5571311977742300…

MALICIOUS

PDF

80.1 KB Created: 2020-10-02 07:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b8aa9026ce049d35fce9cdb56bcf67c8 SHA-1: 189e76263820fb30fe02844aa25bfb4804148281 SHA-256: 55713119777423000923680f009b5af662659bc3daa75bf46b41aab301590661
124 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ggtraff.ru/strik?keyword=apple+balanced+scorecard+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. No scripts were extracted, but the embedded URL is the main indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=apple+balanced+scorecard+pdf In PDF document text
    • http://tatokose.restaurantcleaning.org/uploads/1/3/0/7/130775050/49172.pdfIn PDF document text
    • http://files.littleladyo.com/uploads/1/3/0/9/130969004/furopigolijur.pdfIn PDF document text
    • http://pusazivaw.fisimpson.com/uploads/1/3/0/7/130740510/7698613.pdfIn PDF document text
    • https://site-1038510.mozfiles.com/files/1038510/zizemogiwuxovoradopakaj.pdfIn PDF document text
    • https://site-1037882.mozfiles.com/files/1037882/30386781771.pdfIn PDF document text
    • https://site-1038779.mozfiles.com/files/1038779/35724013020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d0ae8a-bd11-4289-92be-3788c43448df/sopupume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d7f9cd-d057-45d2-b39c-8ae8bcd0ed5e/fuvowemalosemetige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03361149-f9e3-4b3f-8f88-1f62fd427a66/8481148269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e31602a3-c271-4d06-9a6c-70cc82449930/22916034329.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6826/7423/files/90201325035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1046/8251/files/16422752133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/9993/0782/files/sosexasafap.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 5276 bytes
SHA-256: 6fa10790c59621e8af60663f18f53dee9c89bfccaf78d9f2fb85207cd98bc16b
font_01_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 10504 bytes
SHA-256: 56c0004d242b93c8df80adee6325b44ce1b296069094590d4d91cb03e5e99a89

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