Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba43f3317802b34…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 17:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf351daad55118f22350a893ea33d63c SHA-1: 92ad9dc6b119f79b11a524ff67d2957ab9f586ec SHA-256: 7ba43f3317802b347c01e28f31f896149f1e11bac09cd251629c6dcec7ce7b80
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, suggesting an attempt to lead users to malicious content under the guise of a stock earnings report. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a phishing or redirection attack.

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=bili+stock+earnings+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/1460528494.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9178/files/bitmap_example_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/32809677631.pdf
    • https://cdn.shopify.com/s/files/1/0431/4290/6007/files/42438090040.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b2e0677ffdc434289e2fae52a9c2527.pdf
    • https://static.usrfiles.com/ugd/fef806_f3012f983d9246c9abd71460765fbd67.pdf
    • https://static.usrfiles.com/ugd/b8c837_0613e8e5969744308a8b6aa6976a128a.pdf
    • https://static.usrfiles.com/ugd/67f5f7_cf55dc260fd9435280fbfc9a9023d717.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ed3a953927946618ebe8e979f3e18de.pdf
    • https://static.usrfiles.com/ugd/b8c837_449531be947f4abbbab4ac6ba5463b66.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/the_dc_comics_guide_to_pencilling_comics.pdf
    • https://cdn.shopify.com/s/files/1/0429/7034/9731/files/nivegago.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/fotemajugiwotimodeboz.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_off00006115.bin
c4b71cc571819406b1b24e7c0140e2bdc8baed3a41790c81afd3a8079546831e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6115 5216 bytes
font_01_sfnt_off000072eb.bin
c2665689e948eef33da7d22de15c355c3e75eb0380ff76d61e9a489f7ae5666a
pdf-font-stream PDF embedded font (sfnt) at offset 0x72EB 11956 bytes