Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ce894c955928f8…

MALICIOUS

PDF

47.2 KB Created: 2020-09-03 02:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 313157d59b8035c9e290c3f5945b9380 SHA-1: a2248bdfd17737df659c9adf45841784423ca26f SHA-256: e9ce894c955928f83952b70c7a614019c1fb2ac531aa4e005c07326e8d2d2d42
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a link farm and the ML classifier's high confidence score further indicate malicious intent, likely to lure users to 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.com/wix?keyword=sebi+guidelines+for+derivative+market
    • https://cdn.shopify.com/s/files/1/0438/2670/8640/files/aggiornamento_android_huawei_p8_lite.pdf
    • https://cdn.shopify.com/s/files/1/0445/6005/6479/files/61836098794.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/hospital_anxiety_and_depression_scale_arabic.pdf
    • https://static.usrfiles.com/ugd/b8c837_0abcaceee78f4e7dbff6621253b4b752.pdf
    • https://static.usrfiles.com/ugd/88a84f_605545f2f055469ea2f0e7418c49c9d8.pdf
    • https://static.usrfiles.com/ugd/b3bc21_9192ff8b5911453c99d829e84d8e6fa8.pdf
    • https://static.usrfiles.com/ugd/c6ac46_65e0d07c4ecd46f2a1e81847587b97b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_7aefd942af7945398a92b6381d1191bc.pdf
    • https://static.usrfiles.com/ugd/a44510_34e1edd8bd11453d9e2deed04d1434bf.pdf
    • https://static.usrfiles.com/ugd/f2ef67_b85cf2f550534712b25a1d333991761d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a54.bin
bb639d1fb0192524bdf6828c7c2536623cd7ee8cd03c3811e5cadcc666369583		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A54 5592 bytes
font_01_sfnt_off00008d50.bin
3ff7214215667cb9481751f935f9d0b7b36fd6cfc0621c57e48e0a312d743d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D50 10304 bytes

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