Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef4219a2ca55c57…

MALICIOUS

PDF

34.7 KB Created: 2020-09-11 11:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 045fcc7e76316eab37d5bedfe29d1b00 SHA-1: 77ca502e080d9937b95aa5d288f5c5095a8e64ec SHA-256: aef4219a2ca55c5746697f3662d6362a8dcc87883b55a13950445bcffb670b03
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious content, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though partially corrupted, contains text related to a 'mammalian heart anatomy worksheet' and includes the primary malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary intent appears to be directing users to potentially harmful websites through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=mammalian+heart+anatomy+worksheet+internal
    • http://files.markallisonart.com/uploads/1/3/0/9/130969498/donanixu.pdf
    • http://files.goodshepherdseniorapartments.org/uploads/1/3/0/8/130814169/wamanugoronu.pdf
    • http://files.lueoutdoors.com/uploads/1/3/0/9/130969356/zetufexowufij-lumiwit-zogif-vatebufabide.pdf
    • http://wuzor.lilianholm.com/uploads/1/3/1/3/131381045/8421934.pdf
    • http://files.7220mercantile.com/uploads/1/3/1/4/131437725/80d25ac7d57e7c0.pdf
    • http://files.frameglaze.net/uploads/1/3/1/4/131453919/96fe50445f03073.pdf
    • http://files.xlcareerschool.com/uploads/1/3/0/8/130874300/4852108.pdf
    • http://files.mountainbelles.com/uploads/1/3/0/7/130775759/movoxo.pdf
    • https://static.usrfiles.com/ugd/81d6a4_624ff1aa1e1e489b985321cf392cb03b.pdf
    • https://static.usrfiles.com/ugd/db93e9_cc67ad2ea8c14289a5196306971e8d58.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec8fa0036ef7465ea804f506bcd2eca4.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_off00004cc4.bin
ebcbf97a7f4bd4db075b69358ffbc83b808bf350234868a4db7487f2a46ed8f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC4 5188 bytes
font_01_sfnt_off00005e59.bin
50f4845b5a1408161d2ca730d1e4565eab9a08740f45b626a417313fc34c3416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E59 9388 bytes

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