Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf612e775339e45…

MALICIOUS

PDF

39.0 KB Created: 2020-08-15 13:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5576a38f3172373b4d61f2da5e81cf9 SHA-1: 6aa72c4287586d0f1a070c08030144e919e16b00 SHA-256: 8bf612e775339e45dd2e1881b68b674ed527ca15a636910fbc0fc062fb0ad7ed
128 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text related to academic books and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The presence of a 'download button' heuristic further supports the idea of a deceptive download lure.

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.com/wb?keyword=bergey
    • http://files.sylviamassara.com/uploads/1/3/1/4/131438296/gilolisulu.pdf
    • http://files.aliceannephotography.com/uploads/1/3/1/3/131379447/xisejexopore.pdf
    • http://files.danaavant.com/uploads/1/3/2/6/132681665/gerebuxejaruruvanap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0111/files/fuxaxakaxagenuvi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/87167572757.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/mawawulu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1517/files/reluwugapukeketole.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6384338271.pdf
    • https://cdn.shopify.com/s/files/1/0438/9113/0536/files/rijinipugazavaxogupo.pdf
    • https://cdn.shopify.com/s/files/1/0447/9824/7078/files/antivirus_android_tv.pdf
    • https://cdn.shopify.com/s/files/1/0437/9302/3133/files/39777203697.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/vetupibupipazurefo.pdf
    • https://cdn.shopify.com/s/files/1/0445/3544/7711/files/architectural_design_of_school_building.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_off000055f3.bin
5dc043cf6bf799022ddfec9ff92ad16d1d9680c91a0f5333ae9d78e6b3f0ca1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55F3 6080 bytes
font_01_sfnt_off00006a83.bin
56f25cc9532d568f3a1f6979e729c9f0a549980f9bb57a6976e06a2ccb135884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A83 10632 bytes

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