Malicious PDF — malware analysis report

Static analysis result for SHA-256 770990edfe8ea2e3…

MALICIOUS

PDF

41.4 KB Created: 2020-08-05 08:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61adc0ffdd80ca3a069c915afdbd17b4 SHA-1: bba651157e22c65b7d416542d64a8d13b9ec31f1 SHA-256: 770990edfe8ea2e3784018eebeee99ea6f8d79b0f477090ec8835bbfa57a90fa
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though obfuscated, contains a URL that appears to be a lure for exam preparation material. This URL redirects to a malicious domain, likely to deliver a secondary payload or phish for credentials. The large number of embedded links also suggests a link farm for SEO poisoning or traffic redirection.

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.cc/pify?keyword=master+the+catholic+high+school+entrance+exams+2020+pdf
    • http://files.kristinachomicklmft.com/uploads/1/3/2/6/132682303/punerekakil-kurex-tiponowol.pdf
    • http://files.penderharbourheritage.ca/uploads/1/3/0/7/130738765/9808688.pdf
    • http://files.chinovalleylioness.com/uploads/1/3/1/4/131455158/6715049.pdf
    • http://files.unccmsa.org/uploads/1/3/2/7/132712514/6531109.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7912/files/lobatojawesefifagupenabu.pdf
    • https://cdn.shopify.com/s/files/1/0439/5696/1438/files/xufuvezeluki.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7563/files/sezoso.pdf
    • https://cdn.shopify.com/s/files/1/0435/3032/2071/files/nivikobatizevelexi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/galenuri.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8680/files/27172329615.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/bosezofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0429/0376/5158/files/56397391641.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/57437434002.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/vejotivemi.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_off00006068.bin
a03698308fa482289323d7ac81602405659021c9422369f749da7d2119aea30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 5916 bytes
font_01_sfnt_off0000747b.bin
dbcb283fb217e53e6acfc90edac184aaad040507a362efa8775a6cae1674ae15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747B 10472 bytes

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