Malicious PDF — malware analysis report

Static analysis result for SHA-256 610b8e2025ad9ff7…

MALICIOUS

PDF

51.7 KB Created: 2020-08-31 01:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0071bd4874817cc29179f127dc0913f7 SHA-1: 80bc54a893fa2774c792985c83bbb4e7f18e64b3 SHA-256: 610b8e2025ad9ff724840cdaaf368784731e0ab5d8a60575232a33f946d84788
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one prominent URL leading to a redirector service. The document body, though heavily obfuscated, contains text related to an 'Amazon leadership principles and values interview', suggesting a social engineering pretext. The ML classifier and heuristic firings strongly indicate malicious intent, likely related to phishing or a scam. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/wix?keyword=how+to+ace+the+amazon+leadership+principles+and+values+interview
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7d21c0_a1671ae056874102b0b4750748d85cda.pdf
    • https://static.usrfiles.com/ugd/e5a943_0d8634f9d0554f4f8395a573bc596d88.pdf
    • https://static.usrfiles.com/ugd/3e87bf_0b1e7f445e394edc9015f74739d14d31.pdf
    • https://cdn.shopify.com/s/files/1/0428/7053/8406/files/60506451725.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce8485c771254e16b8da408b3e5501c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f792ba54f7334e22b0ec3c5a7773eb15.pdf
    • https://static.usrfiles.com/ugd/b8c837_13cff52808c341408d9d2ff4f2ff97d2.pdf
    • https://static.usrfiles.com/ugd/d01287_82690953fad441119e0228c241b7ac91.pdf
    • https://static.usrfiles.com/ugd/9734e7_b9c54492fa054f278c7b5e06121a46a5.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000890a.bin
24b0b3bb3a70b92d1d79fcac1e98584a88af1c147b11510ac59202d0ac02cd74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890A 5476 bytes
font_01_sfnt_off00009b9a.bin
4f11c2e7cb6b703a15d3fceb7810ae054547a92c98a023748b88e8bca8232a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9A 11212 bytes

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