Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f22920d6f25288…

MALICIOUS

PDF

61.5 KB Created: 2020-08-20 04:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 173c0d84e70a8389ae9fb2bd9a9fd727 SHA-1: 483f7d7b24345c00b7708ebe7824847ab32c73f7 SHA-256: 68f22920d6f2528809b37765122e000a191cd2097ea6ed5f7d91c0aa68f23338
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for an 'adblock for android apk'. The ML classifier and heuristic firings strongly indicate malicious intent, with the document acting as a lure to a potentially harmful website. Although no scripts were directly extracted, the PDF structure and embedded URLs point to a phishing or redirection scheme.

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/pify?keyword=free+adblock+for+android+apk
    • http://begajidov.hhslitmag.com/uploads/1/3/0/7/130740073/8521820.pdf
    • http://files.jcarpentertherapies.com/uploads/1/3/2/8/132814086/f374eb59c27b1c6.pdf
    • http://doded.oldzionwesleyan.com/uploads/1/3/0/7/130738632/fc98a0f3ea017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/averages_and_range_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9234/4999/files/sigofulu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4032/files/77878086252.pdf
    • https://cdn.shopify.com/s/files/1/0448/2239/7088/files/47326901051.pdf
    • https://cdn.shopify.com/s/files/1/0433/8145/7061/files/namujodavemojovusedevet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9560/files/luwarejuzarorobope.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/free_battleship_games_for_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0428/1889/6038/files/21741811468.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/24373957482.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_off00009861.bin
9114abaccb6ea6362c2be320c3b71abe2d7cf82df826627d5a95aa1e8452bd01
pdf-font-stream PDF embedded font (sfnt) at offset 0x9861 5128 bytes
font_01_sfnt_off0000a9e3.bin
77982c807071516277b03841762115498c974baa97758b1cf6bd526c86f9fc22
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E3 10668 bytes
font_02_sfnt_off0000ce56.bin
b9c07489e0906e548fd2321ea551ccb3831683513f6c0abb6df7e71ce3785494
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 17444 bytes