Malicious PDF — malware analysis report

Static analysis result for SHA-256 871f6c7c74f69fbc…

MALICIOUS

PDF

50.2 KB Created: 2020-11-04 22:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a55f6103c7897f2e28f1f46ba341d14b SHA-1: 118cfc3d152bcf0abf7d60d664a99fd0b503c274 SHA-256: 871f6c7c74f69fbcb4b04187bf9a2d119803919cc84de3d81c1abb86f7d840e1
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised with a lure for a popular movie. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier also flagged the document as malicious. The document body contains obfuscated text and multiple embedded URLs, suggesting an attempt to create a link farm for SEO poisoning or to host further malicious content.

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://ggtraff.ru/123?keyword=watch+hobbs+and+shaw+online+free+hd
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f92c8aa0487d.pdf
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/1700446.pdf
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5f9ae9d83cc2e.pdf
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/174fd1b5f85.pdf
    • https://cdn-cms.f-static.net/uploads/4390095/normal_5f9e4422135bc.pdf
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/liximuwuradivemodege.pdf
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/6303076.pdf
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/8748603.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jinabom/hard_flexibility_wand_meaning.pdf
    • https://s3.amazonaws.com/podawakumepewez/comments_in_matlab.pdf
    • https://uploads.strikinglycdn.com/files/34fd0869-a6d9-4cad-8448-0fdffaf3f35e/4678982296.pdf
    • https://s3.amazonaws.com/dotivaf/gejarasolojef.pdf
    • https://s3.amazonaws.com/mubemutolewe/jinx_123_buy_me_a_coke.pdf
    • https://s3.amazonaws.com/widofafane/fluval_e_advanced_electronic_heater_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008452.bin
5222a5bfda1d082e6eb35c9c097df4654aef24a29eae4a95fd153181f10cfdc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8452 5356 bytes
font_01_sfnt_off00009695.bin
72518dee308c000f422862ed10a0b1a872b6979e91493a03f5ccfe6f360c8859
pdf-font-stream PDF embedded font (sfnt) at offset 0x9695 11076 bytes