Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b937504575067c…

MALICIOUS

PDF

59.5 KB Created: 2020-08-01 21:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7aa24c64b197862ffebe1bc1b5921a8 SHA-1: bce9b45cf13f31c4bc66c3a62f913864f0a94ec3 SHA-256: 51b937504575067cb408e560822e3e852cdd565ed26cb454e85cf6ccfbdcc3a1
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=mass+effect+nepheron'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0433/1474/1413/files/15733353517.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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.cc/pify?keyword=mass+effect+nepheron
    • http://files.pacificfinishes.com/uploads/1/3/2/6/132696016/tegivuguniwaj.pdf
    • http://files.faithbaptistsv.org/uploads/1/3/1/4/131407918/gezinojeludu.pdf
    • http://files.editionalicesutton.com/uploads/1/3/0/7/130740521/zitemifekak.pdf
    • https://cdn.shopify.com/s/files/1/0433/1474/1413/files/15733353517.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4136/files/putakujeferodudib.pdf
    • https://cdn.shopify.com/s/files/1/0431/7288/8742/files/jack_johnson_in_between_dreams.pdf
    • https://cdn.shopify.com/s/files/1/0432/7702/5446/files/20505942555.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/54000348331.pdf
    • https://cdn.shopify.com/s/files/1/0429/9109/1875/files/76553251180.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/3958224764.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8065/files/42711519097.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/gaxegotokonejaxesoxidote.pdf
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/28632267195.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.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_off00009ff9.bin
b62f1d3ac47f90a11ce93f1c6a9c28b10712410b2330557cb396ac614cac1054
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF9 4816 bytes
font_01_sfnt_off0000b03e.bin
2730399bb6d49a3ebe6d7fb9809891115d6a20eeb08889d020b1e15f3347d04e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB03E 10128 bytes
font_02_sfnt_off0000d2fa.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 4324 bytes