Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d6382398c7e11d…

MALICIOUS

PDF

50.9 KB Created: 2020-09-02 00:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 222a37ebac9bfdd1e0286996f0e485df SHA-1: 28af5fb36bcb5df7818a653d1cb677e783e3133d SHA-256: 67d6382398c7e11d7b56a06d73747a38d64ea0d15afe676df37023a90ac63960
154 Risk Score

Malware Insights

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

The PDF contains numerous links, a significant portion of which point to a redirector service known for hosting malicious content. The document body, though partially corrupted, includes text related to financial revaluation and a URL that appears to be part of a link farm designed to attract traffic. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to further malicious sites.

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.link/pify?keyword=revaluation+of+fixed+assets+on+balance+sheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/227d0f_a179d7088dad4b1ba245aaa1eb206fc0.pdf
    • https://static.usrfiles.com/ugd/9cc572_e4f17592cc6f4a6d99b4ea346d8fb52b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c156cb0b3be843ce97a3e570bb728c2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_decd755ffaf740bcaa3f681a02f97f30.pdf
    • https://static.usrfiles.com/ugd/b8c837_72e9c39d86e94f288a36cc2c4e53eecc.pdf
    • https://static.usrfiles.com/ugd/ca300b_660185560b8f4f58ac1a5e069f2b4fa4.pdf
    • https://static.usrfiles.com/ugd/ff2e72_62545d0fafeb47bdbac870d0c3d6697f.pdf
    • https://static.usrfiles.com/ugd/b8c837_14104f3d5adf4f858db1a113b1010be9.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_79780035e4d94321a48ad20ac9a531fa.pdf
    • https://static.usrfiles.com/ugd/a467d2_7305ad1b11204868b975a83f18181650.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/94666452037.pdf
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/fazevavekodujomadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/zupimipubijiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2009/0535/files/serefedanasi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/notibara.pdf
    • https://cdn.shopify.com/s/files/1/0434/4617/3852/files/ford_555_backhoe_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/small_scale_broiler_farming.pdf
    • https://cdn.shopify.com/s/files/1/0435/1364/3167/files/83719550587.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_off0000887a.bin
f7e363aecdb2ec67cbd57f93bde1c2e567d6b2b2437c6bfa0c88b055600b36b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887A 5288 bytes
font_01_sfnt_off00009a88.bin
6ab2a02f66dc25fa0098bbf0f3f9304f9ced557d5515da2056f97a7523ed6c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A88 10484 bytes

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