Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c76cb6b98750b2…

MALICIOUS

PDF

42.0 KB Created: 2020-08-29 07:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eb40906949e478c5bcb84040b69ea7a SHA-1: c38486c740f11a10d003a567532236a906fc4b8b SHA-256: 82c76cb6b98750b2097e48852a6b490b32efa6b3b1bf501704a0c34f80b92874
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting an attempt to drive traffic to external sites. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which is likely used to deliver a secondary payload or phish for credentials.

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=sample+resignation+letter+due+to+better+opportunity
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d960f1f71f894325888f121507b199c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_88cab1e966274f4aa27a3ebed96c5585.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef9bff7715084d1098bf4381f9438443.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f6c7368f94247e494fa07c04dd2c076.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1a3c6a2b87f4eca88f6755432295503.pdf
    • https://static.usrfiles.com/ugd/b8c837_c63e815e773a4c7ea93a1fa3253f668e.pdf
    • https://static.usrfiles.com/ugd/b8c837_855f1828950c49308e396aa98137963a.pdf
    • https://static.usrfiles.com/ugd/b8c837_59d454b30adc47edb1a065119f5ce234.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb28072733b24862b11105ec8d3431bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5015d7093324947bdb15965c442a8df.pdf
    • https://static.usrfiles.com/ugd/b8c837_2968bec767fc414990ff7115e05a105f.pdf
    • https://static.usrfiles.com/ugd/b8c837_15b281b7a1174926accdf296b76d35f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_043b03a4fe244744ae6adb5078defd7e.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/laporan_pendahuluan_chepalgia.pdf
    • https://cdn.shopify.com/s/files/1/0438/3175/4902/files/7381720837.pdf
    • https://cdn.shopify.com/s/files/1/0437/9030/3393/files/vozodipufalogosexapulok.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/11995091747.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_off000065e4.bin
6530180c0eead8e5592703ea3c4bc7feddf91894d6f1ffad27761b3cbde15675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E4 5624 bytes
font_01_sfnt_off000078e9.bin
ee51355b877e03a329fc46a00a7d9c22d73a112e81ab6d7e3f6b5215f240c6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E9 9840 bytes

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