Malicious PDF — malware analysis report

Static analysis result for SHA-256 8511ee069b1d162b…

MALICIOUS

PDF

115.8 KB Created: 2020-11-02 04:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce26d622280a2e6314a565adc258e5d9 SHA-1: 6e04db1003a8bba64c4e853085447aee66c59c50 SHA-256: 8511ee069b1d162b11a41548af8d0a0fb4b8bb68ca86f8bf5def4ca6f61cd154
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cctraff.ru/123?keyword=selena+autopsy+report
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/wepepukuvejibi.pdf
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/tekeruzevuvas.pdf
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/wesuzivuzukupiripat.pdf
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/95a09e.pdf
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f8a4f8c680df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/62ad58aa-d9c4-4935-8e25-c474333acb81/75129812559.pdf
    • https://uploads.strikinglycdn.com/files/6b83134c-4145-47c4-9ead-0e1953a247ac/laruwelazonemav.pdf
    • https://uploads.strikinglycdn.com/files/8241aa82-82e5-45d1-be21-277af59bf93a/69295452074.pdf
    • https://uploads.strikinglycdn.com/files/2e6dff99-9674-463f-8bb5-20ac87bb99ad/morizotorexu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a93.bin
a379c82f34ff1744a1752313f1082225ee279d94107954e58ae5d133e9258b67
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A93 4852 bytes
font_01_sfnt_off00018b1c.bin
366ebf4cd3057114650129384fdc78d42a38b83c1894cc10baa005a3f578325b
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B1C 12616 bytes
font_02_sfnt_off0001b41e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B41E 4324 bytes