Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ce906934831120…

MALICIOUS

PDF

80.5 KB Created: 2020-08-23 19:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22607428ce3c530f3d5f311584bbc623 SHA-1: f5c986c77b2469fdc90393a3de1ed724ecc52838 SHA-256: 65ce9069348311209d7d7f35a61a008d481ae6e1e39fc6fd9521abb0118196bf
174 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'breach of contract form letter', which is a common lure for phishing or malware delivery. The ML classifier strongly flagged this PDF as malicious. The presence of numerous embedded links, including one pointing to a known malicious redirector, indicates an attempt to direct the user to a harmful site.

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.
  • 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.cc/pify?keyword=breach+of+contract+form+letter
    • http://files.elder-well.net/uploads/1/3/1/4/131437924/tojuja_tomafivu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/zemokerezeseveweroxagoto.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1304/files/88131955128.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/54693508644.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/wukotet.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/74502403444.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/2020_calendar_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/6909/3541/files/formation_covadis_10._1.pdf
    • https://cdn.shopify.com/s/files/1/0431/5922/4469/files/82367814779.pdf
    • https://cdn.shopify.com/s/files/1/0439/6836/4702/files/jixatotulaginunixerefevi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/59242340815.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/vusuvabewopobuxipavi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f776.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 2828 bytes
font_01_sfnt_off00010171.bin
86142ac5893d295aa621ff326232f3da35260a483c2eab5598e10b05b24a5a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 4992 bytes
font_02_sfnt_off0001123b.bin
9ba953b2791f00f3239c84f7d494108543cafd45ccfc8b1e79d070d704b37e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 10088 bytes

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