Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3698509baff27c5…

MALICIOUS

PDF

55.5 KB Created: 2020-10-15 23:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 44f993e514bd6f47e1d461aec449ecc1 SHA-1: f57fa7ebc1cd93a36333e0378b76176e9cbb0a7e SHA-256: f3698509baff27c5f49f06b8487d74baad82e4240336f494f4a5629dc02619ae
184 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a game mod, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm on disposable hosting further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gettraff.ru/123?keyword=stickman+legends+shadow+wars+apk+mod+2.3.40 In PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/6848636.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/welale_kidifita_wejozosididi_xanox.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/pekaberosevaji-navoxojulan.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/ff5aa.pdfIn PDF document text
    • https://site-1043395.mozfiles.com/files/1043395/rekaxe.pdfIn PDF document text
    • https://site-1044148.mozfiles.com/files/1044148/rolovukawoxukabeso.pdfIn PDF document text
    • https://site-1039811.mozfiles.com/files/1039811/56199700895.pdfIn PDF document text
    • https://site-1036995.mozfiles.com/files/1036995/wojogaxebivapi.pdfIn PDF document text
    • https://site-1043803.mozfiles.com/files/1043803/65074015313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f8839bfe5fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f87183b2e9c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f87b318dd095.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/06752b1a-5e4c-41a4-a56a-fdf38e579ea9/tufigewakodoguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9533460d-1923-431b-8eac-65c489524d55/penadutef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1f340d-44dd-420d-a323-6506482231ae/51148086644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67db3d21-806f-4237-8f31-5909b5fd1203/ketejazolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88f7c3b-dcc5-4cd6-ab9b-d588d0587e4e/pegulikixidovemima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910077c0-8da3-4e89-aa2b-b58ddd0fd9d2/91933891908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25c8f69-abf1-440c-bdbc-5708593917ac/68214736727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114cd26c-4ed5-4212-8969-6437c4348a5e/wedenumi.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_off000082b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B3 6304 bytes
SHA-256: 7adbacfa8af40b6d8a88eac4107a7086ff8a84acad325fd96a81568be7e91c6f
font_01_sfnt_off00009809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9809 10416 bytes
SHA-256: fb8995a68bff6652304b2d93c107133f7845b63f3d2d0253d2241a343cebdb8f
font_02_sfnt_off0000bb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6D 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210