Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bb79c5a7fca063…

MALICIOUS

PDF

41.5 KB Created: 2020-08-25 08:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c492b81be39488fac92f0e450ad6fac8 SHA-1: 61c0cc90c98f46344dfff987bd6b3f07cc47d158 SHA-256: 68bb79c5a7fca063e4c6c61081505a7a8045abaf54e275b4bad8003bdde2c39a
214 Risk Score

Malware Insights

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

The PDF document contains a lure related to disabling Google Chrome auto-updates, directing users to a malicious redirector. It also exhibits characteristics of a link farm, with numerous embedded links to other PDFs. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and the redirector link indicate a social engineering attempt to compromise the user.

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.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=google+chrome+auto+update+disable+android
    • http://files.laythedraw.net/uploads/1/3/0/8/130813516/4582280.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/surah_ayatul_kursi_bangla_translation.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/buchungsstze_bungen_mit_vorsteuer_und_umsatzsteuer.pdf
    • https://cdn.shopify.com/s/files/1/0430/6488/5402/files/19277717008.pdf
    • https://cdn.shopify.com/s/files/1/0432/8341/5204/files/90833380962.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/pafumosojax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5276/files/22123208382.pdf
    • https://cdn.shopify.com/s/files/1/0460/9877/6228/files/chrome_portable_offline_installer.pdf
    • https://cdn.shopify.com/s/files/1/0428/2282/8198/files/cbse_maths_book_for_class_4.pdf
    • https://cdn.shopify.com/s/files/1/0434/2130/2935/files/28548929586.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/husqvarna_340_chainsaw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9691/4587/files/33365441813.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/kinerivumokudif.pdf
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/88207710053.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2714/files/kipoxibakaludidixuv.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_off00006236.bin
742adca5d4b2ea8f9f2d00f018eb967dbe7912149362e1494bfbacba5d2bcb5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6236 5656 bytes
font_01_sfnt_off00007547.bin
692c426cdabbfbb3818739f02e1deb43f4d953edf2be90f0bf42d90a3c239e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7547 10524 bytes

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