Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a374f18bd54248…

MALICIOUS

PDF

43.1 KB Created: 2020-08-03 08:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be50b9db9a307ace0e7ca0cfb4ac760d SHA-1: 3a5a0e1f3f3afe00180ebd31329e2f35716b48aa SHA-256: 21a374f18bd54248880a67bc851376d47d6858a27cbb02f4a212e9474460ea9b
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=free+romantic+novel+pdf`. This URL is part of a link farm designed to appear as free content, likely to deceive users into clicking. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and numerous other URLs hosted on `cdn.shopify.com` and various other domains, suggesting a broad distribution effort for potentially malicious content.

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=free+romantic+novel+pdf
    • http://files.samanthadasilva.com/uploads/1/3/2/6/132682640/miwide.pdf
    • http://files.524kou.com/uploads/1/3/1/4/131437457/suvoxog.pdf
    • http://files.trebor-ts.com/uploads/1/3/1/8/131871690/4fa93.pdf
    • http://files.dragonchoirs.net/uploads/1/3/1/3/131380504/nebemebiber-gorik-fiwumoxunubowe.pdf
    • http://files.ornamentsofexpression.com/uploads/1/3/1/4/131455883/vojosa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/read_incest_comics_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/26621687700.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/36968031072.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/negurajenifuxegesine.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/tesip.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/48695885779.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/16119785080.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9772/files/astra_child_theme.pdf
    • https://cdn.shopify.com/s/files/1/0434/0390/3127/files/70748604439.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/73906353379.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/pobade.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/hp_laserjet_1536dnf_mfp.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/35290976459.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_off00006bc1.bin
d0c9ea09b36ad9f5e4afc9fdfef0039af68474a03b839b7bae6b0c95de5bca10
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC1 5136 bytes
font_01_sfnt_off00007d2e.bin
d61c461f64564baa4e86cffd9d45924f86fc4ec5c7ec73eeb6f6e0154c47bbaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2E 10088 bytes