Malicious PDF — malware analysis report

Static analysis result for SHA-256 82aa6e451239a808…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 21:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6e624655a75aed807ce01a33ead8a81 SHA-1: c0f024f9c13c371258dfc7ae49e4fe15f0178265 SHA-256: 82aa6e451239a808d7026c073b08ef50ff2aa91e9ea879775712e79b115f6dad
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'endangered animals essay' and a URL that appears to be part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this file. The primary attack vector is likely social engineering via a deceptive link within the PDF.

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=animales+en+peligro+de+extincion+ensayo
    • https://static.usrfiles.com/ugd/b8c837_beaf0f4ae0944100b8047c300d0beb16.pdf
    • https://static.usrfiles.com/ugd/b8c837_d83b184370934853a2b4a1122439dfd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c23f1188a5154b8980cb8176da2cb52b.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/fuwaxowelakapafodulivazer.pdf
    • https://cdn.shopify.com/s/files/1/0460/1652/8551/files/antipasti_veloci_freddi_senza_formaggio.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/xovitaras.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/guxunotorilavofasot.pdf
    • https://cdn.shopify.com/s/files/1/0450/1939/8294/files/car_parts_vocabulary_word_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/41901987332.pdf
    • https://cdn.shopify.com/s/files/1/0434/5220/3161/files/jopadilima.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/impact_of_packaging_on_consumer_buying_behaviour_questionnaire.pdf
    • https://static.usrfiles.com/ugd/bae363_f90153d56e5a4c37af16b591db426e94.pdf
    • https://static.usrfiles.com/ugd/b8c837_1afed4af97774fb89ac2cd30adfd8427.pdf
    • https://static.usrfiles.com/ugd/b8c837_222e21fa17104e15808008453b568317.pdf
    • https://static.usrfiles.com/ugd/f96b02_98b49c530fd147bd92f1fdb104119c2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_88bc911aeabf48e18febfdc89e56fdd9.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_off00006d00.bin
1c50b7d6f7dcba375f2a3c6c5e402655a1b3afaf0c19ed167617ad4ddb04d27b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D00 5552 bytes
font_01_sfnt_off00007fc1.bin
4181d62a52dbc121f388178dd5d439f354191f7fa90eb7468c16310cbbe15b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC1 10992 bytes