Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb40f2944acb34c…

MALICIOUS

PDF

39.4 KB Created: 2020-08-31 06:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df51e08e7039de62bcdff8bc93cfcacd SHA-1: cd8b815b2ff7a0f1bba1c03902daa0b31402f2ac SHA-256: 0cb40f2944acb34c524323de82f6727550a2ddb82596bc412209d89fad9a0679
154 Risk Score

Malware Insights

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

This PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL ttraff.ru. The document body, though obfuscated, contains text related to a 'crafting guide' and the wkhtmltopdf application, suggesting a lure to trick users into clicking the malicious link. The presence of numerous external PDF links further supports the SEO link farm heuristic, indicating a campaign to drive traffic to potentially harmful sites.

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=don%2527t+starve+together+crafting+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/japawufiwemakef.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3273/files/zesty_clam_meat_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/hierarchy_of_needs_by_abraham_maslow.pdf
    • https://static.usrfiles.com/ugd/df4650_3c53e84b72c945149664bf48e15bcaab.pdf
    • https://static.usrfiles.com/ugd/6f58fb_46290babac8b484da7f0d305bbeac997.pdf
    • https://static.usrfiles.com/ugd/b8c837_d960f1f71f894325888f121507b199c6.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_590d931ebfda473196672361b48f5492.pdf
    • https://static.usrfiles.com/ugd/963627_ae4054759e20474bad7b58905a66a5d2.pdf
    • https://static.usrfiles.com/ugd/269bb8_0708a7d8a5a741f991177a0bc9a25a4f.pdf
    • https://static.usrfiles.com/ugd/b444d4_c2ffa2be80d243eba979807f84d97483.pdf
    • https://static.usrfiles.com/ugd/353d00_464d1d431b9342038e2fad21154257c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cb973119c11473c929f99e9e82a0979.pdf
    • https://static.usrfiles.com/ugd/493135_6bc21db2a79041f88077b8622fe1d528.pdf
    • https://static.usrfiles.com/ugd/8cbfce_cdb627f0cc2a4583bec784b5749ce204.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_off00005b7b.bin
a289773fe23ba4c68f734b0437b9bf450df3a6515eed8a1f10fa5ac95670049d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7B 5344 bytes
font_01_sfnt_off00006db2.bin
706f4cd7d4ec901c7854e324614367405a2293e43704cbba837898293e43c7bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB2 10256 bytes

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