Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f67b1103172021…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 01:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22a369e25b541da33a2fe9c9338ee7c4 SHA-1: 3c3d4e5fad63bb2c1748f9e06ebb0eb4d4c61f1c SHA-256: 47f67b1103172021048fd100e1f4f44abdd9f6856f75b01aa682a3029ed316da
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about interview questions. The primary malicious URL, https://ttraff.ru/wix?keyword=top+10+behavioral+interview+questions+and+answers+pdf, is designed to lead the user to further malicious content. The PDF also contains a large number of links to other PDFs, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, but the presence of a critical redirector heuristic and ML flagging indicates malicious intent.

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.ru/wix?keyword=top+10+behavioral+interview+questions+and+answers+pdf
    • https://static.usrfiles.com/ugd/b8c837_1eeb1d42e4af45868d3c1e9680d850aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_41b445d729604eb491da607c374981f2.pdf
    • https://static.usrfiles.com/ugd/60933b_885adb39a1a942a2bcf8d14e7ea3db94.pdf
    • https://static.usrfiles.com/ugd/50c35f_68e9104c52ea4337833954c33ddd5448.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5423/files/povokugidurojerilejil.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb6fca7f18444a6a859001c0166b6698.pdf
    • https://static.usrfiles.com/ugd/32acb1_aced01cd2d944494b3757e7202e6e913.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6a7acd930df4189b0463412e8d27f4b.pdf
    • https://static.usrfiles.com/ugd/6f58fb_599b594c84c24c7ea7f809c8e8e129d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_21d6ff3c49214fa6ac49425e5d180274.pdf
    • https://static.usrfiles.com/ugd/b972d5_e06fb498ae7c4bfb9fd3f5aa4693bf64.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa221773c22547fdb89987f057ae7911.pdf
    • https://static.usrfiles.com/ugd/f09a9d_2f7767def7ba47f79a9dea82586a98ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ba776081e1a4b24b12f870d08ffc894.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_off00006035.bin
5244d01375f7c844970bf998bd3f2d3a2f39cb5f4c53c7f4e0cdf5ee95f6d98e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6035 5692 bytes
font_01_sfnt_off0000738e.bin
2472a0ec4d207f3e942fda37eee36220f033fd4f0efc1296de3e15a91013fba3
pdf-font-stream PDF embedded font (sfnt) at offset 0x738E 10136 bytes