Malicious PDF — malware analysis report

Static analysis result for SHA-256 c147a5b67c62c910…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 02:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcbc7db76528b0c43520906fda4dbd94 SHA-1: 318e5dccf8c274d914d71a627a55e2d461d6c59b SHA-256: c147a5b67c62c910bdeea36ba46bbb0d93b8d482ef01044cca9032c7647ba3c7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'vyapam profile form pdf download' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting the malicious intent of redirecting users to potentially harmful 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.cc/wix?keyword=vyapam+profile+form+pdf+download
    • https://static.usrfiles.com/ugd/b8c837_5c1f2cc44e1941a7b05bf5c0715eae8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_27a585d233e94e27a2dc28e0bd69e478.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8aca27c7d4542239c51cec8aad82f48.pdf
    • https://cdn.shopify.com/s/files/1/0431/1760/9122/files/10709695399.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/rikaweriwevisera.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/semilexapiwave.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/mofabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/lafebinopevapobaxoxalow.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_486e6c48361043a1bb45bfa9313e509e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ac9d0e5cf1f46d081f2ad6ed61f82e4.pdf
    • https://static.usrfiles.com/ugd/61804c_51a15407b60547a7bd5fad31b91489f8.pdf
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/aua_guideline_bladder_cancer.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/66862790881.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/47075410237.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/16651484741.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055ac.bin
6405ed9eec9fd29ff599052bd6249bb0911b20dd4cb7204839ded2719e41c275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55AC 5168 bytes
font_01_sfnt_off0000673e.bin
62ae0cfe733d9f7c80220f6ca04fd0eeb86f314bc5ca6cd3c5fa20d8028e7e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673E 10196 bytes
font_02_sfnt_off000089f1.bin
e6481cd1c3c18eb977dad8d196041bafb0056e4c5894ef3b87f1276ad2a25fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F1 7836 bytes

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