Malicious PDF — malware analysis report

Static analysis result for SHA-256 78aa1ab63967c597…

MALICIOUS

PDF

39.3 KB Created: 2020-08-05 15:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8411535a02f242d3dcb752b8cf1f895b SHA-1: 2b09933dc3902ef3fd07827a289282b3468d61c3 SHA-256: 78aa1ab63967c597339c75bbb9c0cc58cfa25e77378eb8f7ad3b44413ac59ce4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, includes text suggesting it is a 'lesson plan PDF' and contains the malicious URL. The presence of many external PDF links, some benign and some unknown, suggests a link farm or SEO poisoning tactic to obscure the malicious destination.

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/wb?keyword=columbian%20exchange%20lesson%20plan%20pdf
    • http://files.kwintradius.com/uploads/1/3/0/7/130739664/buregotoves-beforelazupip-raronuwiguw.pdf
    • http://files.kstilson.com/uploads/1/3/2/6/132695401/dawixepikukidofofi.pdf
    • http://files.docsdrummingworld.com/uploads/1/3/2/6/132696145/4210848.pdf
    • http://files.malloryanneporch.com/uploads/1/3/0/9/130968937/korudaru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/munifogofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/calamity_ganon_botw.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/50603820225.pdf
    • https://cdn.shopify.com/s/files/1/0446/6756/8291/files/cawl_the_great_work.pdf
    • https://cdn.shopify.com/s/files/1/0448/1197/6855/files/sonicwall_global_vpn_client_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5095/0041/files/70159555698.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/dance_with_my_father_chords.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/vemiviralenagupolazater.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/tilusopatawafetazu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5480/files/jatitubobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/faleza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69298849274.pdf
    • https://cdn.shopify.com/s/files/1/0437/8030/9141/files/pc_master_race_reddit.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_off00005b68.bin
2274923ac25fd6927f4ef26f064e093f757873ff2f3fba4b85a2b05e80ed0235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B68 5584 bytes
font_01_sfnt_off00006e3b.bin
ce68607276034a659f26c3b495138ffda0cb20d1b56f11661647e3303f555d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3B 9928 bytes

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