Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fdf2791e7e6f28…

MALICIOUS

PDF

54.4 KB Created: 2020-07-29 09:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0608abb0e18290812cea45df62c91f1 SHA-1: 40e47b79a3ecdb8563477493de847516d34b9979 SHA-256: f5fdf2791e7e6f28248b46763ff5c69bc7b75d23d91b7a8f645fcb449e56e717
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body is heavily obfuscated, but the presence of the redirector link and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to harmful content. The ML classifier also flagged this PDF with high confidence.

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=bridgetown+barbados+port+guide
    • http://files.acpnutrition.com/uploads/1/3/2/6/132695915/puzixokawivusalutew.pdf
    • http://files.regalimagegermanshepherds.com/uploads/1/3/0/7/130775490/f8df9.pdf
    • http://files.dmkconstruction.org/uploads/1/3/0/7/130739155/sawup.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/punititom.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/6210471947.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/59471783959.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/nepixet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88406012193.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dazekenikajupupapunel.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/66405135533.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/16536455349.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sibubemazalomasedexikeme.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/63049895770.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/vowutarisimejuluw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2089/4886/files/25018330521.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/mafakof.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000094fe.bin
1e54639f2ce917d64a475ce9d7fa32c9aecbe22fb60f088c6251747304442539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94FE 5256 bytes
font_01_sfnt_off0000a6f2.bin
e2c3ae75339ff21a8c554c3588e9e1906ef2addb028cc9371e7415ac9e5d6cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6F2 11108 bytes

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