Malicious PDF — malware analysis report

Static analysis result for SHA-256 9905cb64e113bab5…

MALICIOUS

PDF

41.1 KB Created: 2020-08-07 20:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d8ed7e4c25fa8dfd061849896947a11 SHA-1: c7badaf3e09b85592330f4e0c8dfb82edc3df7de SHA-256: 9905cb64e113bab5d5835af804266097877961c84604142f6ee7ded3bd4cd176
120 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.cc/pify?keyword=bsc+maths+syllabus+2020+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The document also contains a large number of external PDF links, many hosted on Shopify, which is characteristic of SEO link farm abuse to obscure the malicious redirector. No scripts were extracted from this sample.

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=bsc+maths+syllabus+2020+pdf
    • http://files.nwflyboys.com/uploads/1/3/1/6/131606335/c06bb2c94.pdf
    • http://files.bayareadebate.com/uploads/1/3/1/3/131380612/ad288d.pdf
    • http://files.davislab.ca/uploads/1/3/1/1/131164081/dirapuxovo.pdf
    • http://files.olivetbiblechurch.org/uploads/1/3/1/3/131378990/fb8028d.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/anglican_hymn_book_common_praise.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0429/5150/8131/files/46813051303.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/rezukijofowuw.pdf
    • https://cdn.shopify.com/s/files/1/0440/0916/0862/files/kimofafuxupiteropimi.pdf
    • https://cdn.shopify.com/s/files/1/0450/7097/5128/files/addition_and_subtraction_facts_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0449/8151/8494/files/aiag_fmea_4.pdf
    • https://cdn.shopify.com/s/files/1/0437/8945/1416/files/petorurijemiluxogufusanus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/judinalu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/11858882769.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/75461564201.pdf
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/27235344887.pdf
    • https://cdn.shopify.com/s/files/1/0433/3813/7755/files/lateral_knee_pain_exercises.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_off000060c9.bin
53a816b317222bad278461c71a64b542d2742efdc47114271eadee0f4f1c5168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C9 5864 bytes
font_01_sfnt_off000074a6.bin
36cc7bf8a3b134339d49b0e509b8dfb86ae136693409a6543e6cb4ba27b42d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A6 10128 bytes

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