Malicious PDF — malware analysis report

Static analysis result for SHA-256 71682847ff1ff469…

MALICIOUS

PDF

43.1 KB Created: 2020-08-14 10:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bbdc2a5cc6ad6f17c23c8fcbba77d10 SHA-1: 51a5543fcd719e2c6812c63e95a9e0ef3eec6724 SHA-256: 71682847ff1ff469b5634c22b5c16d7859c8be64c857fb7fefd7e5045c4f30e2
182 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains text suggesting a 'project report' lure, which is consistent with phishing or malware distribution tactics. The presence of a high ML score and critical heuristic firings for malicious redirectors and link farms strongly indicate malicious intent.

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.
  • 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
  • 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.ru/pify?keyword=project+report+on+vermicompost+unit
    • http://files.amaneceryachtcharterscozumel.com/uploads/1/3/2/6/132683367/rizikozeriw-severabajim-kimoludosode.pdf
    • http://files.mirkesinsurance.com/uploads/1/3/1/6/131606429/7167227.pdf
    • http://janofu.frailtyprevention.co.uk/uploads/1/3/0/7/130739423/1501791.pdf
    • http://files.devokehunters.com/uploads/1/3/2/6/132695782/4018102.pdf
    • http://rilotonel.friendsofswedehollow.org/uploads/1/3/0/8/130813592/bf4c26.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/15544485593.pdf
    • https://cdn.shopify.com/s/files/1/0429/2644/0607/files/soxukuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/18395469080.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/betraying_big_brother.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/pibepidoxales.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/mirajiruvevufidebazepipa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/87063176896.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/xunanakunizi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2960/8101/files/xibumabafu.pdf
    • https://cdn.shopify.com/s/files/1/0449/0277/6999/files/33877791986.pdf
    • https://cdn.shopify.com/s/files/1/0439/4683/6123/files/29431126807.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/82825876972.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_off00006afe.bin
a4b6aaa03010e6b325100afe05ba9102e98d29fa16e68d8a0c06a7961d27ef56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFE 4972 bytes
font_01_sfnt_off00007be0.bin
212a4c516ae5a32fd4874c74d38222bf3611d4de4a70cb58d265a508b996fb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE0 10488 bytes

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