Malicious PDF — malware analysis report

Static analysis result for SHA-256 11735563ac5d4293…

MALICIOUS

PDF

41.8 KB Created: 2020-08-12 03:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 876d244ba64aa35b889cf15afda48342 SHA-1: c9984acacf2c49ae6ce22233ca2a03b6dfff8c55 SHA-256: 11735563ac5d429368b413c37ca7a2eb65c86e5285842e41aec148fa18dfa9ae
194 Risk Score

Malware Insights

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

This PDF document contains numerous links, many of which point to external PDF files hosted on various domains. One prominent link, 'https://ttraff.cc/pify?keyword=capitalist+realism+mark+fisher+pdf', is identified as a malicious redirector. The document's structure and the presence of these links suggest an attempt to direct users to potentially harmful content, likely for phishing or malware distribution. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/pify?keyword=capitalist+realism+mark+fisher+pdf
    • http://vojisu.ramiroplumb.com/uploads/1/3/1/4/131437736/5854901.pdf
    • http://files.splitlevel.studio/uploads/1/3/1/4/131453712/niwodadoritojunoza.pdf
    • http://gesuzofu.atticrodentbarriersystemsonline.com/uploads/1/3/1/4/131406717/9342747.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/81878360113.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/53302325959.pdf
    • https://cdn.shopify.com/s/files/1/0439/1154/4987/files/poster_bahaya_merokok.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8085/files/pukodar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/topexala.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1195/files/sevensins_gta_5.pdf
    • https://cdn.shopify.com/s/files/1/0430/0744/3103/files/zudutupadokojuriwujijuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/85551481407.pdf
    • https://cdn.shopify.com/s/files/1/0439/1052/9176/files/82925943316.pdf
    • https://cdn.shopify.com/s/files/1/0431/7390/4545/files/79444090102.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/lubarexusawevipesik.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_off00006611.bin
d6da73c835fb136d26f4fbe3b7b7c6e906f5e4a034aa9367a58e7122614f0bf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6611 5248 bytes
font_01_sfnt_off000077c3.bin
502fa326c9641ae3c9024a3eb670586ed3884ebfe12a01c936781796479487b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 10136 bytes

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