Malicious PDF — malware analysis report

Static analysis result for SHA-256 658230a74ae0a00a…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 11:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75b348ba4d165754906a5220c245d54b SHA-1: 276eaa39e2f39a8ad17ce72d884aa0eab93305fc SHA-256: 658230a74ae0a00ad5ffe332b7ea89ddf0795b0cdf138937f9dfc704e63078b2
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The document body, though heavily obfuscated, contains the malicious URL, suggesting it's designed to lure users to a harmful site. No scripts were extracted, but the presence of embedded URLs points to a phishing or scam attempt.

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.cc/wix?keyword=comparative+biomechanics+vogel+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/dynex_tv_manual.pdf
    • https://cdn.shopify.com/s/files/1/0459/1733/9797/files/american_film_a_history_john_lewis_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43377474007.pdf
    • https://cdn.shopify.com/s/files/1/0464/0243/7275/files/81349056875.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/99087681343.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/63411202308.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0220/files/tixesedukezapovo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/muful.pdf
    • https://static.usrfiles.com/ugd/eda9ba_143eefbea2434d688a6091152a39d4d2.pdf
    • https://static.usrfiles.com/ugd/b7ab08_1a09761b559c47d4a6e7e3b72f76f675.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b66.bin
62abe22f31a1b386b939bc55b8059cc82c5e7ddbc766cb40796ab5296a22a4ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B66 5676 bytes
font_01_sfnt_off00006e84.bin
aefa8549ee42f8cf4dc2abe0146540e91fe41d535109a7a02516c99f2cfd598e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E84 10148 bytes
font_02_sfnt_off00009125.bin
1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9125 16148 bytes