Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79695ab03cd2112…

MALICIOUS

PDF

40.9 KB Created: 2020-09-04 14:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4544abe77c52d5b22bd0474024353d8f SHA-1: 009dc03dc588be4e7bd56fe2814b09d0811afae0 SHA-256: e79695ab03cd2112c2ef8183db37b055b61be5d1ccc01902bcde74475843326f
128 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to static.usrfiles.com, forming a link farm. One prominent link, 'https://ttraff.club/pify?keyword=bittorrent++for+windows+10+32+bit', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Bittorrent for windows 10 32 bit' and a call-to-action phrase, suggesting a lure for software download. The combination of link farming and a malicious redirector indicates an attempt to lead users to a harmful destination.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/pify?keyword=bittorrent++for+windows+10+32+bit
    • https://static.usrfiles.com/ugd/696b8a_3ce3987473eb4fa3b2ea8ca6479f910e.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_7557a08c2e9b44ba9b472b57cbf33803.pdf
    • https://static.usrfiles.com/ugd/529dbf_dd4e36cc1f7c4d13a374ae408f243a2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_476e506ee621455a999c44bbb08bdf8b.pdf
    • https://static.usrfiles.com/ugd/bae363_100378cd191240369f3d48cdba8eeb72.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcc0cc1e0227497490770403dbc9ede9.pdf
    • https://static.usrfiles.com/ugd/b8c837_33906e7b17164d1da9613f6d42afb0ce.pdf
    • https://static.usrfiles.com/ugd/b85eb0_bdf08a65efbe4f909dd804265e5c2dac.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/19089564428.pdf
    • https://cdn.shopify.com/s/files/1/0432/8777/3342/files/lokuwitorasewen.pdf
    • https://cdn.shopify.com/s/files/1/0436/1070/1981/files/81173223116.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/zunexamusajikovufapa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/69075240332.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_off00006136.bin
d2afa78b5958ae8b448cf5830dbdab9f3ec173b570c8a3d51a4a019015d99498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6136 5432 bytes
font_01_sfnt_off000073d9.bin
4659cf01b2b4f8c638d4a68ed871929b59f24658ee6355a18c2f16fde7c59aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D9 10296 bytes

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