Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c3bd3a5fba12ee…

MALICIOUS

PDF

50.3 KB Created: 2020-09-08 20:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8a9fbaf135cfe15cc009579c22e2446 SHA-1: 63f43722fb161163c679716b36e5e87ac08f270e SHA-256: 31c3bd3a5fba12eecfe58695e81efdacfaf66bb1789e8bee3047a5bd5dac2ba2
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful destination. The presence of numerous external PDF links, many pointing to the same domain, suggests a link farm or SEO manipulation tactic to obscure the malicious intent. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious URL.

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.link/wix?keyword=carl+jung+personality+theory+pdf
    • https://static.usrfiles.com/ugd/b8c837_0852081b39c14d01beebae5b6fbdd89e.pdf
    • https://static.usrfiles.com/ugd/b8c837_57d8345793724ebf8e47b8b2e268f02e.pdf
    • https://static.usrfiles.com/ugd/868b90_3d4f323dddcb448cba75a2ff457e1311.pdf
    • https://static.usrfiles.com/ugd/a107db_83f4a20f1ea9453d89318c4d1c4aff0a.pdf
    • https://static.usrfiles.com/ugd/affb4a_31b2e88c8f0a41b5901a42562842cb0c.pdf
    • https://static.usrfiles.com/ugd/31593d_758519b7009042698fd9e31708ac85af.pdf
    • https://static.usrfiles.com/ugd/0511f5_1b67650100c44d82974ad27bcc88f70f.pdf
    • https://static.usrfiles.com/ugd/39cb9d_8ca443f12dfb4b51945c3fb8745805df.pdf
    • https://static.usrfiles.com/ugd/54bec1_ac2a7193faee45ddbf3b1c477cd441f3.pdf
    • https://static.usrfiles.com/ugd/a382ee_51386a36087148bfb8410237ea9fb059.pdf
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/arthritis_deformans.pdf
    • https://cdn.shopify.com/s/files/1/0460/2006/7487/files/excel_format_cell_number_as_text.pdf
    • https://cdn.shopify.com/s/files/1/0438/2828/1506/files/music_to_iphone_files.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5188/files/35312415141.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0d15a98e73a46568002f219140aba0e.pdf
    • https://static.usrfiles.com/ugd/aa14a9_4515793936bf4e4b86d8ad4f8eb748a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_30e5cc5025a64bebbebfacf31c504f08.pdf
    • https://static.usrfiles.com/ugd/e643da_22248fc85d9348339fa0a1e4abcf6ccb.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_off00006f61.bin
bb14ee9a6ead731005c0bcd08d066a46d1e5ab3f288cb3928d3cc8ec95446e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F61 5388 bytes
font_01_sfnt_off000081b6.bin
0e3fca93c69c0bdbffa65aa27e4ec3367b6c0a82ece99d3e4a09fa1869552a69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B6 9820 bytes
font_02_sfnt_off0000a382.bin
36d0ab9aae8e190d220f68a750b932edbe3f8152ac3fa653a3ce5b6665b89a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA382 17064 bytes

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