Malicious PDF — malware analysis report

Static analysis result for SHA-256 1717447a382b2e6a…

MALICIOUS

PDF

107.3 KB Created: 2020-04-23 07:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b9e03cb1651e893256f8acc2e8db96e6 SHA-1: b00ce95cffb80bf08d773b61b05ac4a6777b3eb7 SHA-256: 1717447a382b2e6aa2aa923c5e3491d4dc0aa7589cb11e6621a0b61b105ede7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, a common tactic for link farms or phishing campaigns. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's designed as a payment redirection lure. The document body, though heavily obfuscated, contains text related to tax installment guides, likely a pretext to encourage users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://collegeadmissioncat.com/uploads/1/3/1/3/131381722/131381722.html#cra+corporate+tax+installment+guide
    • http://bthebuyer.com/uploads/1/3/1/6/131606134/d66f28f92e.pdf
    • http://monthlyphysicalchallenge.com/uploads/1/3/0/5/130539458/a908d2e3.pdf
    • http://leww.xyz/uploads/1/3/1/4/131406498/bugodamexevadavesuk.pdf
    • http://directwindowinstallers.com/uploads/1/3/1/4/131437806/8537044.pdf
    • http://2017giants.com/uploads/1/3/1/3/131383533/bf569a682a94a8.pdf
    • http://sandraoriley.com/uploads/1/3/1/4/131454304/nejokividobiga.pdf
    • http://liveasoundlife.com/uploads/1/3/1/3/131380005/a9ff397b55e6.pdf
    • http://cte7.com/uploads/1/3/1/3/131398177/paxodudavejeraxa.pdf
    • http://ecoservicios.net/uploads/1/3/0/7/130739779/5914524.pdf
    • http://bonedeepthreads.com/uploads/1/3/0/4/130483074/zapafa_pukofiliniwan.pdf
    • http://bearvalleymensministry.com/uploads/1/3/0/5/130543052/soxozunilu.pdf
    • http://oakroaster.com/uploads/1/3/0/6/130639814/vonelabegowixesogofe.pdf
    • http://averytstone.com/uploads/1/3/0/6/130621620/6628ea2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016609.bin
fd38d5ddb7be95d3bd41d0e35c4a7f74f326fa7f9d26015eca083df0797508eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16609 9600 bytes
font_01_sfnt_off000189e4.bin
78116880e9c902c31767bfa12a9ff84ada309181a52ab1aa29cdf6fbfe115b45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x189E4 2600 bytes
font_02_sfnt_off000192e5.bin
66495800c3033db752395888c57a2472d7780c6e20f93c23d8607484346c200d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192E5 4068 bytes

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