Malicious PDF — malware analysis report

Static analysis result for SHA-256 542c848193cb6fb6…

MALICIOUS

PDF

38.1 KB Created: 2020-10-04 23:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bee0cd4a1c7f1177a35163d1878c6fe8 SHA-1: 678e6d0960d50a49355524f81de4ee7c20b3db15 SHA-256: 542c848193cb6fb678b62681caa1a8ef823d03e5f2e80d4b53d191410616d614
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a crossword answer key. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

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://ggtraff.ru/strik?keyword=cody+crossword+answers+all+levels In PDF document text
    • http://suzej.cisdbooksandbytes.org/uploads/1/3/1/3/131383613/8289789.pdfIn PDF document text
    • http://fagaw.little-childrens-bible-school.com/uploads/1/3/0/8/130874588/1484034.pdfIn PDF document text
    • http://supufem.garycollinsphotography.com/uploads/1/3/1/3/131384240/bunudikajepo.pdfIn PDF document text
    • http://files.aptutorgroup.com/uploads/1/3/0/8/130874205/6297090.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/d98e1368-692d-4c49-96ea-81b692808157/11436576636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b87ab4-269c-455b-b1de-f2001385b51b/28561969009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e213fac-dba0-457b-a567-e103e1ffd233/gemilepibiwix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2449/5004/files/famous_blue_raincoat_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf334aa-d1b3-481b-afb9-5f61c00af498/towedipobikegigaraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93021080-373a-4f9e-99f0-fb165a05b749/kemuxofaloxubepizod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7674a03-076f-4ad5-9ed4-76ccce8b2b05/zuferabalaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b209eae1-db0d-4bd2-8f78-c1fb15315abd/momevaselevikijemip.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5892 5092 bytes
SHA-256: 54e06c3e865afe61ade5ba33b561851b4b2d491ce0c16d1c0084c7fc437e10dc
font_01_sfnt_off00006a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0A 9944 bytes
SHA-256: 254366eb4226d2b563e3d3ad10d954abe6348b9e997f1481e7b714a5a1f2f822