Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2ed57f77c8d748…

MALICIOUS

PDF

40.2 KB Created: 2020-08-09 09:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889472cd1500c9fe28e6c8382b930042 SHA-1: d5cf16797ca61bc81f14575b1d070398ca608c93 SHA-256: 3d2ed57f77c8d74807130ddafeabf2d176d099195cda970f5b383ed63883c6ff
128 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or a lure to download further content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into clicking malicious links. The primary malicious IOC is the redirector URL.

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.cc/pify?keyword=design+and+analysis+of+algorithms+pdf
    • http://files.wanderwithwool.com/uploads/1/3/1/8/131856186/6043341.pdf
    • http://files.kelciechiquillo.com/uploads/1/3/1/4/131453718/xugajedemigatobuki.pdf
    • http://nujumuz.jonathan-jarvis.co.uk/uploads/1/3/2/7/132710621/1856a9678a1.pdf
    • http://files.nykpart.com/uploads/1/3/0/7/130739776/zolewa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7603/files/63026657747.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72645751706.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/vezikezuru.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/77491591733.pdf
    • https://cdn.shopify.com/s/files/1/0429/9227/1519/files/tolofobed.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/dojedotebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/xikirokexawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/66247341782.pdf
    • https://cdn.shopify.com/s/files/1/0436/9953/6040/files/vixufi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/94188900158.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3829/files/97025594702.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakoximowukod.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_off00005e07.bin
4b0dbbf875f9119d4c150724613d79cc7fc5d3f55b8cc79647f990e1b54cf022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E07 5556 bytes
font_01_sfnt_off000070d2.bin
b60a0f1b1a6b795c699835eeadd36cabc0b3b33a945a78f6d838a6c041ccb2f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D2 10280 bytes

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