Malicious PDF — malware analysis report

Static analysis result for SHA-256 538b086c90799883…

MALICIOUS

PDF

38.9 KB Created: 2020-10-05 00:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 213edde79846ede061dcde3681f610de SHA-1: a8dce041a0ff5bb50352fbddcdb26cc62e5d119f SHA-256: 538b086c90799883c1b1a8c6ecf1421e466d52c5c6782fa47d4733efedd18eca
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/pify?keyword=big+face+watches+cheap'. The document body, though heavily obfuscated, also contains this URL, reinforcing its malicious intent. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves tricking the user into clicking the embedded malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.link/pify?keyword=big+face+watches+cheap
    • https://site-1043536.mozfiles.com/files/1043536/gipizolizisigigemugu.pdf
    • https://site-1036783.mozfiles.com/files/1036783/rapumomolob.pdf
    • https://site-1036824.mozfiles.com/files/1036824/tutuwewaluwelugitugap.pdf
    • https://site-1036745.mozfiles.com/files/1036745/28253695656.pdf
    • https://site-1036721.mozfiles.com/files/1036721/fimexasabopipenup.pdf
    • https://site-1037260.mozfiles.com/files/1037260/fegikipakedatufe.pdf
    • https://uploads.strikinglycdn.com/files/0ac8fcb9-a293-4f7f-8f65-6413cbdaba8a/49673107258.pdf
    • https://uploads.strikinglycdn.com/files/72099812-0152-4732-b817-2f9fa7551567/73812186683.pdf
    • https://uploads.strikinglycdn.com/files/bcccc8c0-564c-44a6-b8fd-ddfda6621769/diwizobibiruvuganesexotoz.pdf
    • https://uploads.strikinglycdn.com/files/f9bf8dff-d0b4-44a2-a422-9017a6f49117/tamixunojonidoga.pdf
    • https://uploads.strikinglycdn.com/files/78b6f788-bec4-4e6d-befb-ef461ffac5e3/vikusevab.pdf
    • https://uploads.strikinglycdn.com/files/f8b5163a-62f1-4840-8c8b-75e09e35ef9c/17307515424.pdf
    • https://uploads.strikinglycdn.com/files/248e70e7-4eb4-4167-96bf-ccd58136c34e/1626235952.pdf
    • https://uploads.strikinglycdn.com/files/757dc8a0-e6cd-4878-bd79-767662ef2667/68048637306.pdf
    • https://uploads.strikinglycdn.com/files/61d3f3c9-f0a9-4f61-9677-0e18458e1fb1/63052454123.pdf
    • https://uploads.strikinglycdn.com/files/804f5faa-765a-475f-afcf-5373fb7289ec/jogafuwudum.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f8a.bin
a100abd88c99d001ee0a528a0dee574aec3fd6cb8e08d21235b3f933242978c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F8A 1584 bytes
font_01_sfnt_off00005792.bin
198b0c576df8d398e7587912643759d83c87db729c85168d9a4558398ae04328
pdf-font-stream PDF embedded font (sfnt) at offset 0x5792 5292 bytes
font_02_sfnt_off000069b9.bin
5484289b03cdc238369b09c73bf811f286e70ffd5cb99e5cf4c20cfc8d844b3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B9 10348 bytes