Malicious PDF — malware analysis report

Static analysis result for SHA-256 c039793f132cfbd7…

MALICIOUS

PDF

44.9 KB Created: 2020-09-11 17:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c826b629005d6a3caf2dfa381d4687e4 SHA-1: b98af099284f41591b97f0be92c28ea6f5027cd9 SHA-256: c039793f132cfbd75e23217ed9101af725cda1eef54f66ee2a110ac2d8c93f4e
152 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.me/wix?keyword=manuale+joyetech+cuboid+mini'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, one of which is 'https://static.usrfiles.com/ugd/87b9a8_e1cbb7df62654d0da31cf14f852584bd.pdf'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of malicious URLs suggests a phishing or malware distribution attempt.

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.me/wix?keyword=manuale+joyetech+cuboid+mini
    • https://static.usrfiles.com/ugd/87b9a8_e1cbb7df62654d0da31cf14f852584bd.pdf
    • https://static.usrfiles.com/ugd/2c8d66_4627ffdb4943481782c44dbe790cc0ea.pdf
    • https://static.usrfiles.com/ugd/f46427_7756bdead6b044d380a09e72d31c45eb.pdf
    • https://static.usrfiles.com/ugd/9d66c7_bdb3da3b17504f6f89eb52fe3ce2d837.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_5ede461f928646f8bad2f5a4fd1b2351.pdf
    • https://static.usrfiles.com/ugd/80fd5d_b8383053126a4fef89c75ce0b11322cb.pdf
    • https://static.usrfiles.com/ugd/60e703_800a69b850764e07b29dee2d9bcbe2e9.pdf
    • https://static.usrfiles.com/ugd/760a88_857476b61c7b4c56be42ec496a4678ce.pdf
    • https://static.usrfiles.com/ugd/71fd01_72bbed91159c451da8e7caa790d67057.pdf
    • https://static.usrfiles.com/ugd/934fc3_783b89d0e9ef4bbb9af18f98acc3d96a.pdf
    • https://static.usrfiles.com/ugd/66f3f9_e9f9ef3bca4c47219dd0e86109e60064.pdf
    • https://static.usrfiles.com/ugd/ba3095_acc3edeff8414a35905f3355f6e39678.pdf
    • https://static.usrfiles.com/ugd/76156b_bc1743b85d20498c81fbb80eae2f0ae2.pdf
    • https://static.usrfiles.com/ugd/be5703_63aa065993a24eb5b3bddaad1814b81b.pdf
    • https://static.usrfiles.com/ugd/64bd79_0a061e6afe0b470cacd523ef963f1aa3.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_off00006846.bin
4620e3c7adb401358ea398b0c054fd4cdbdb60c428fb79ef23b91b33025aa726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6846 2880 bytes
font_01_sfnt_off00007287.bin
f9fb2be9b86398d0a3e163e9e90565a73658e7801e12fae3090801d9a72f35ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7287 5228 bytes
font_02_sfnt_off00008442.bin
4d1f8f64bce20466b7f6e8eb71fb44841c5f96843d9d75a5533bf00b767c5cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8442 10124 bytes

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