Malicious PDF — malware analysis report

Static analysis result for SHA-256 669cf803cd32e285…

MALICIOUS

PDF

41.4 KB Created: 2020-08-21 19:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e148366b6a0b52de23bd272043503be SHA-1: 64a9c8cadd866bf773e744f9d004bd64d3ffb681 SHA-256: 669cf803cd32e285a032d695ce2ec53382e608adffa3d3c13c2c5d849dc20cbe
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to what appears to be a link farm designed to host PDF files. One prominent link directs to a known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=navy+uniform+allowance+2018, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=navy+uniform+allowance+2018
    • http://kunuruku.breedengallery.com/uploads/1/3/2/7/132740829/7213947.pdf
    • http://files.mrsherrow.com/uploads/1/3/1/1/131164520/bijubivizupiz.pdf
    • http://keted.centralcemetery.net/uploads/1/3/0/8/130813059/sopijemebus_baxutudaviv_padubusukabix.pdf
    • http://figel.adamshandmadesoap.com/uploads/1/3/2/7/132712572/pipadelejasaf.pdf
    • http://komegoxon.meetplaychill.com/uploads/1/3/0/8/130873804/2140336.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5805/2763/files/wow_argent_crusade.pdf
    • https://cdn.shopify.com/s/files/1/0435/9720/1576/files/calisthenics_for_beginners_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/jifukesodi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/counter_affidavit_legal_forms.pdf
    • https://cdn.shopify.com/s/files/1/0432/1837/0728/files/vupemoziparibukuzafonezoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7466/7164/files/77946430545.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/xozupifurupezibuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/0461/5066/files/71487636653.pdf
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/remaxadusivavugin.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/jizujopuferarili.pdf
    • https://cdn.shopify.com/s/files/1/0431/0034/0381/files/dokevatusogetix.pdf
    • https://cdn.shopify.com/s/files/1/0435/5771/6127/files/cisco_asa_5512_firepower_datasheet.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_off00006302.bin
e063a95d6cf340804dc3d08027d79d66cee120db602fd2afd2ba610a2baccc63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6302 5592 bytes
font_01_sfnt_off00007613.bin
42c40dbc278a1a918de9dfc3a48b58fbfee271a4ca2bea554286d8def1ddd30f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7613 10080 bytes

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