Malicious PDF — malware analysis report

Static analysis result for SHA-256 8840f03e757499c5…

MALICIOUS

PDF

121.9 KB Created: 2020-08-24 11:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ef3b0906ee7aab02a1d03ce1899b223 SHA-1: eedd11bbce3739cc06bf7b04c081e2b67cc8537e SHA-256: 8840f03e757499c53b19755b615e7068213d5b33160414772cab55593188e820
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link disguised as a browser update lure, which is a common social engineering tactic. The document also includes a mass of external PDF links, likely to obscure the malicious intent and evade detection. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL points to a likely download or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/pify?keyword=chromium+64+bit+windows
    • http://mawavig.lashiousbeautysalon.co.uk/uploads/1/3/1/3/131382133/383da7.pdf
    • http://files.zainabhardware.com/uploads/1/3/0/7/130775936/puvonu.pdf
    • http://xazapenop.scfriends.org/uploads/1/3/1/0/131070998/caf7e3a2.pdf
    • http://wasen.graysandbluesofmontreal.com/uploads/1/3/0/7/130776485/tekafewurujana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5752/8480/files/confluence_wiki_faq_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/8270/3257/files/77195482858.pdf
    • https://cdn.shopify.com/s/files/1/0443/8091/3830/files/mt_snow_snow_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/9636/7511/files/porut.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/six_sigma_black_belt.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7430/files/xidawugevimalig.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/77527649945.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4070/files/ketif.pdf
    • https://cdn.shopify.com/s/files/1/0428/8954/3836/files/subjonctif_ccdmd.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/78202147975.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000176e3.bin
2b215d67aa84c6eb48a810c295d97948de92a9be7b5e720477b7f4e76e76d854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176E3 5084 bytes
font_01_sfnt_off00018813.bin
2d66601b17117ca42b13f8c198d481d46158a007665965648675b5327bacc635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18813 14724 bytes
font_02_sfnt_off0001b6fc.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6FC 16312 bytes
font_03_sfnt_off0001cc88.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC88 4324 bytes

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