Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c33d1d0c8607f2f…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 22:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09970ba825d88bc2b10c95f2d06b7bdd SHA-1: 69eede90485c79067c5daa266409b616a4ff0809 SHA-256: 5c33d1d0c8607f2f8415c1a26a390d82efb8f70a0ca83725516575e604773150
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, with one prominent link directing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'openoffice templates cv', suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=openoffice+templates+cv
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5ed537_d0e193232db44f89bf8a86e029f01257.pdf
    • https://static.usrfiles.com/ugd/a01749_47c5efe138be4de588b61c676bb7049c.pdf
    • https://static.usrfiles.com/ugd/227d0f_6deb6412c35a4ab5a5b7b9a57d8a0480.pdf
    • https://static.usrfiles.com/ugd/aef5b7_ddf57b8ac049422b98abdd34ba288eea.pdf
    • https://static.usrfiles.com/ugd/e2b09b_9bbf6db166de46ab9431990ee41aeaf7.pdf
    • https://static.usrfiles.com/ugd/29c71c_4bb57315ea6b45a284eea8fc6cc2d5b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b24d0f4f2f92465e83538cb48651541f.pdf
    • https://static.usrfiles.com/ugd/18f527_368dc9fe6f1e426d80b52993a016591a.pdf
    • https://static.usrfiles.com/ugd/455f95_51ad6fb1f25040df8af67012bf1c5f0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_642773ac15ce4b6585d5d3bfa5f34a20.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/60812308820.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/libros_de_ortopedia_pediatrica.pdf
    • https://cdn.shopify.com/s/files/1/0436/4579/6512/files/bovijevewu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/upper_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/1860/0095/files/tecnologia_assistiva_fisioterapia.pdf
    • https://static.usrfiles.com/ugd/b4a829_7ff94833248b477eace7da719a9dbcf8.pdf
    • https://static.usrfiles.com/ugd/de65f7_ffdfa7decf6a43b39f948653cdb13fd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_60f941783ff54948925393a1e465d837.pdf
    • https://static.usrfiles.com/ugd/b8c837_e64ffd810cc94ce9856bbf1a598e6d9d.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_off000062e7.bin
a395ea16c062dd0f01a379b3ec04d63da6b6ab6e390933b32e77816e0c887139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E7 5152 bytes
font_01_sfnt_off0000746a.bin
9d90a42632d9698825060c366ac30a6ef02649a1df888486cb153e5bee5b8e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746A 10364 bytes

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