Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb7f2047f93f710…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 16:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20179c833d23e1ced1c42e54d278d50a SHA-1: 02d60ae26b3446491bc2fbcd46f0daefa2d4a418 SHA-256: 5bb7f2047f93f710b67df8d194b3291723a1cfa85df609a6f72c24562c660783
154 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, primarily through its extensive use of external links. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a link to a known malicious redirector, and 'PDF_SEO_LINK_FARM' highlights a large number of outbound links, suggesting a link farm or distribution mechanism. The presence of an embedded URL in the document body further supports this. While no scripts were extracted, the overall structure and link farm behavior point towards an attempt to distribute or redirect users to 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://ttraff.com/pify?keyword=eclipselink+in+eclipse
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4117a9_e4e46149944f4ebdb7a32a193aaca216.pdf
    • https://static.usrfiles.com/ugd/e3ff21_c486ed65255344b1984ae38b68427547.pdf
    • https://static.usrfiles.com/ugd/23e9be_92bfce3e3b37441f919914a5af59363e.pdf
    • https://static.usrfiles.com/ugd/b8c837_680cec348eef439dabd0a506550f8eb2.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/amapiano_sound_pack.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/allah_k_99_names.pdf
    • https://static.usrfiles.com/ugd/1849a1_4bc0619afa164063b066a9949ff98c0d.pdf
    • https://static.usrfiles.com/ugd/6da380_17d1b62fa5264ea18ea91bb40e99f618.pdf
    • https://static.usrfiles.com/ugd/724fb5_404c47102f844ae1a076626a08535266.pdf
    • https://static.usrfiles.com/ugd/5be868_44101e2ff0814866a13153df5ddbb786.pdf
    • https://static.usrfiles.com/ugd/b8c837_6428d094ffd544ac8253c4fc7f9177d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c08e2b32d974bb4bce95ae801a6f177.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_off00006b50.bin
3352483adad8b5a96c4e3ee6d63c6ac5a5110a56283e60e982d71a185ac63b36
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B50 4640 bytes
font_01_sfnt_off00007b3d.bin
1f946253857c0aeed4d716dfdb12d01983a6a16ea295b70dc457e786c0b08cc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3D 10488 bytes