Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7245f6e8b35d361…

MALICIOUS

PDF

60.1 KB Created: 2020-09-06 18:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b82c6a0dc0ab10c718b516f0f357681f SHA-1: ed8c90f66700c78a93517ff66749a1043a1ceec6 SHA-256: a7245f6e8b35d3611498f2c1c2fb7ae0306adbf34b311b287e043df449b98948
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.me, which is disguised as a download for "Adventist hymn songs". The PDF also functions as a link farm, directing users to numerous other PDFs hosted on static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.me/pify?keyword=adventist+hymn+songs+free
    • https://static.usrfiles.com/ugd/837d34_d1ac77b158aa4a15b7f15fea8497a59a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6d962f75d774111b7aa9bd6f628e037.pdf
    • https://static.usrfiles.com/ugd/b0c717_724169032a544ecf850e75ced322620b.pdf
    • https://static.usrfiles.com/ugd/9bd82e_1bb9625355064376b78cbd4c099fcb8e.pdf
    • https://static.usrfiles.com/ugd/0286dd_4a97585941dd41c08817cc3c68e5fc61.pdf
    • https://static.usrfiles.com/ugd/e4ff69_708c9874214b44789e92adae1933c886.pdf
    • https://static.usrfiles.com/ugd/d4c4cf_d8085212c24541fca3cdf570d4c09ae5.pdf
    • https://static.usrfiles.com/ugd/0511f5_54b86335bc934d3f9e38ffbfa4bd1369.pdf
    • https://cdn.shopify.com/s/files/1/0434/8893/6102/files/76166263844.pdf
    • https://cdn.shopify.com/s/files/1/0432/5700/4192/files/podremos_vivir_juntos_alain_touraine_libro.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/90779365967.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/15650833823.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/69759027298.pdf
    • https://cdn.shopify.com/s/files/1/0436/3016/6176/files/banking_and_financial_awareness_bankers_adda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a0a8.bin
b0d98e99697d8fcdb999be157dae0dd4bd8fd6c4682a0c3c7d103dcc33d317b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A8 5228 bytes
font_01_sfnt_off0000b254.bin
168f9a6f301117c297470a33ba6b7674fdc11e3ba10217599661812b3c8586fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB254 4532 bytes
font_02_sfnt_off0000bee6.bin
8a294df02ffd97a66d6e3dd84962cfe4e0053734f9bee01ba538e52f475bad2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE6 10728 bytes

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