Malicious PDF — malware analysis report

Static analysis result for SHA-256 133f159356fa2a18…

MALICIOUS

PDF

44.2 KB Created: 2020-08-29 15:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4252b55ed28ec204979c8aabe841dca0 SHA-1: c7798c905489e54f38d42a11371a7c897b5b2ae3 SHA-256: 133f159356fa2a18a1428245057b8b45070a67ee139d44f7a38fe79b0d1d5e5d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for a PDF document. The presence of a malicious redirector and a large number of external links indicates an attempt to drive traffic to potentially harmful sites, likely for phishing or malware delivery.

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.cc/wix?keyword=research+methodology+in+applied+economics+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7327/2998/files/mathematical_classification_and_clustering.pdf
    • https://cdn.shopify.com/s/files/1/0436/7505/8329/files/encyclopedia_of_computer_science_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/96261741329.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/gusoxejuzotete.pdf
    • https://cdn.shopify.com/s/files/1/0436/6771/8309/files/cours_capteur_de_pression.pdf
    • https://cdn.shopify.com/s/files/1/0448/3943/6449/files/85542787960.pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/21837306657.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/filmywap_world_new_bollywood_movies_2019.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/tusozipulitimanema.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/defecto_septal_atrial.pdf
    • https://static.usrfiles.com/ugd/b8c837_8802e6d6dfc24d6abd5ed5a757618d64.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c0f24aff7b047609dab73deaffd0e8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7ceaabc4d1945d08c2a6225905d296a.pdf
    • https://static.usrfiles.com/ugd/b8c837_70326a70e89b4679b8a42a9ed222a8a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_e43104bb12ff43969414a551f4cd2022.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056ff.bin
fd6a59ea33a37a758c0c784f68e22b7b13f4f8d96830cbaed5ec89e5480cebff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56FF 5680 bytes
font_01_sfnt_off00006a32.bin
31bc868662987fa53e1c4d107627685d9641b4d9161b2536541ac539210a90d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A32 9840 bytes
font_02_sfnt_off00008c2f.bin
89205101c3a81bb5ea701df88febed72c19966aa2a803f2cabe3e2ca4d57082e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2F 16752 bytes

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