Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d841db9988fe58e…

MALICIOUS

PDF

39.6 KB Created: 2020-08-29 15:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01354833c5dc02f2e99ba3192896eeef SHA-1: dcf3dccdb5968810e61671ac726973a8c71d44a5 SHA-256: 3d841db9988fe58e0d5039027c93301ccbd2c100f5b9e32aac331d6c48675a4a
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded external links, many of which lead to a redirector URL. The document body contains text that appears to be a title and some metadata, but the primary malicious functionality is driven by the numerous links. The ML classifier also strongly indicated maliciousness. The presence of a redirector URL suggests a phishing or scam attempt, aiming to lure users to a malicious site.

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.com/wix?keyword=rubrica+para+evaluar+exposicion+de+p
    • https://static.usrfiles.com/ugd/b8c837_e3dcb6f9f96d49f39e6506ed47859c05.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ad85f5ae8da4d7c99c617cbe6626cb2.pdf
    • https://static.usrfiles.com/ugd/b8c837_92074b9a757c491eba549f6adecaa1e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f38cb052435c4fe7a7880d25155df6cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_c612aa6c3eb24ee98c48caaadba5c8bb.pdf
    • https://cdn.shopify.com/s/files/1/0429/6933/3916/files/anatomical_position_and_directional_terms.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/94018742304.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/98101211250.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/el_bullying_verbal.pdf
    • https://cdn.shopify.com/s/files/1/0438/6642/3456/files/84801635413.pdf
    • https://cdn.shopify.com/s/files/1/0463/9693/2251/files/52993773944.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1fac94d232c474b8aa36e3b150783ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a46d5b8ab294e7a97e3382c3e3bb177.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e01101c276c4def90c95f0ac247a265.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed20c1791e7246ed816be19494ce6b07.pdf
    • https://static.usrfiles.com/ugd/b8c837_253cc0ff78e042fdb1ed281ec2f3713b.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_off00005b98.bin
3e2f815eaed9ff2f8fb84b87f61c8396237294ba20b94bbe62a380a317fde023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B98 5344 bytes
font_01_sfnt_off00006dcf.bin
d90a585b6ae1bf7122d7cc1153b4403e0cccfdd10a8a34c3e442e5ccaa7d4904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCF 10412 bytes

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