Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8738d3c93e8131f…

MALICIOUS

PDF

35.9 KB Created: 2020-08-18 20:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 725841eaeaa658c375d4103d1d452ca5 SHA-1: df1357b5d0e3ed5be0978d3d746366301661fee4 SHA-256: d8738d3c93e8131f62ce310b46820b008385d8f14a020f98972e5ff1345649b0
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=cadillac+catera+performance+parts'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains the same redirector URL and other URLs that are likely part of the link farm. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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.ru/pify?keyword=cadillac+catera+performance+parts
    • http://pigob.littlefootbridges.com/uploads/1/3/1/6/131606000/a9a73f5.pdf
    • http://puririxo.kateschroederlpc.com/uploads/1/3/0/7/130739640/4261690.pdf
    • http://files.awynterstyle.com/uploads/1/3/1/8/131871745/lobagiwugurisuposisu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/singapore_sri_lanka_free_trade_agreement_sinhala.pdf
    • https://cdn.shopify.com/s/files/1/0451/0711/8233/files/chess_3d_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/lavolibuvegenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/tufajenav.pdf
    • https://cdn.shopify.com/s/files/1/0440/3711/1973/files/gilisojosizoxesaximovixix.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/17246461652.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/list_of_appropriate_preposition_with_bangla_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/breeding_guppies.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/journal_bearing_design_procedure.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_off00004d98.bin
ac09235fb6db01ae035b398e8bf895091790e7076caf4fd8d7343c757288d4a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D98 5208 bytes
font_01_sfnt_off00005f31.bin
6ba23cab67ca7a0e6f33617a228871b655a47561fc11a26f9de44ba763d42050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F31 10488 bytes

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