Malicious PDF — malware analysis report

Static analysis result for SHA-256 101b81643c4eded5…

MALICIOUS

PDF

79.2 KB Created: 2020-09-15 11:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24d63617c87ce346cb9e33ab78340670 SHA-1: 73f23ec388b1ac8e1b7a2a5323d60d1b500be868 SHA-256: 101b81643c4eded5f8bc84c700df634729039b188efb00ba48269055c2ab4006
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. Additionally, the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic indicates the document's content is designed to trick users into believing they have won a prize or are due a large sum of money, requiring them to pay a fee for delivery. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/wb?keyword=special%20characters%20allowed%20lol
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/74e905_283e83370209460388450f79fa39964e.pdf
    • https://static.usrfiles.com/ugd/062c90_5082f94258b14dec91bf25edb13afd42.pdf
    • https://static.usrfiles.com/ugd/24853a_e74b2f585d484644b571dc8c79faa204.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/62629634331.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/ziputevofalirox.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/public_health_ontario_ipac_answers.pdf
    • https://cdn.shopify.com/s/files/1/0467/9955/2663/files/romezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/asme_b16_5.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6143/files/jeripijawigiwulika.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/70223822911.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_off0000efed.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 2828 bytes
font_01_sfnt_off0000f9e7.bin
6dccb477535f4adf9b7d1f4ef4904d3a3148137bd6bccbee76a6989e136b1bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 5356 bytes
font_02_sfnt_off00010c24.bin
e7c87bd5b9c960e0aa208bac471425aa6a6cba0284a819d4db23ec0d833bfb07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 10420 bytes

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