Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b3b338440a96e5…

MALICIOUS

PDF

62.1 KB Created: 2020-08-30 03:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f872cecdfde1165896d35207c25c20b7 SHA-1: 37b81cd168cffb5b75208e6fb447d0ccbe00219c SHA-256: 27b3b338440a96e5f571e433c33932bb834680968f49747a073e68e858b37928
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains the URL https://ttraff.ru/wix?keyword=cuentos+infantiles+cortos+sobre+sentimientos+y+emociones, which is flagged as malicious. Additionally, the PDF exhibits characteristics of a link farm, with many links pointing to static.usrfiles.com, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly indicates maliciousness.

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.ru/wix?keyword=cuentos+infantiles+cortos+sobre+sentimientos+y+emociones
    • https://static.usrfiles.com/ugd/b8c837_c0f0038b036a46fb83fd4948d088a571.pdf
    • https://static.usrfiles.com/ugd/93c935_12d6c9270d6b4b048510b2dc9aa9b220.pdf
    • https://static.usrfiles.com/ugd/0789d5_05f2740e74cc4bddbc5c7769fac87609.pdf
    • https://static.usrfiles.com/ugd/b8c837_b20ae8f684ef4b89ba39516117201ef4.pdf
    • https://static.usrfiles.com/ugd/b8c837_39a44fc9681047a7a18a1bb62915b09d.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_b57b9dc06aea41e497a2a2b41cf6fb6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_35f541860a7a4d03b64aaf45e2b94f5f.pdf
    • https://static.usrfiles.com/ugd/7598fa_9b9596a0527b40808a8136188f1ca1ee.pdf
    • https://static.usrfiles.com/ugd/5899d5_383d4cbdff4d4af38162d6849126c7e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ecce2c2441a42d0b8ca3ab46d43b0e0.pdf
    • https://static.usrfiles.com/ugd/c068f8_5350b0ca66e14f818a9d9e47fa4e7818.pdf
    • https://static.usrfiles.com/ugd/c7a620_c8ce626a610340878877bbbd59d156b9.pdf
    • https://static.usrfiles.com/ugd/f0e51d_7a0b4e882f5f437e9c6bd6d2b237eed6.pdf
    • https://static.usrfiles.com/ugd/eda9ba_1e3cd65e0b49484cb2970cbbe7cd7e5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dd9e39362df4ba9bf162aeb72cb3f66.pdf
    • https://static.usrfiles.com/ugd/b8c837_b78f99b4222b4a828ab3645a0b5c9f49.pdf
    • https://static.usrfiles.com/ugd/b8c837_7dc2931988214758ae7ed0004285d4b9.pdf
    • https://static.usrfiles.com/ugd/06497e_842b9ad67602411fba79b39c4639410c.pdf
    • https://static.usrfiles.com/ugd/b58d21_582e6c87005445749009260ea97f0169.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_off0000a4c0.bin
cbef4875566f461c631a390630d39b1cf9354770d50fe96053776fe63d524011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4C0 5176 bytes
font_01_sfnt_off0000b64e.bin
617af01463a09e943921a7386a4a83abc213ace42ec47997532cd5b4d6dd21d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB64E 11228 bytes
font_02_sfnt_off0000dac9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 4324 bytes

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