Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e91ae07ed07bfc5…

MALICIOUS

PDF

42.6 KB Created: 2020-08-29 23:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 973d45caa2ee439369987c59d3cd12af SHA-1: 9cb6d122004ca5cc43847962745641a81e6649b0 SHA-256: 0e91ae07ed07bfc5baf796205967caf833ba0009c394683345e93f0e33e6b267
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to external content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/wix?keyword=enem+2017+questoes
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d6daeec956dc4b1891dab3b63d0089a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_93df851ba33a428ba21dde46959a3e73.pdf
    • https://static.usrfiles.com/ugd/b8c837_ada084d37453491c81c6fd609163feab.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/xowamavexidodedetereg.pdf
    • https://cdn.shopify.com/s/files/1/0431/0584/5397/files/ninivutudefozusafazejole.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/gobojuderosove.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/simple_company_profile_sample.pdf
    • https://cdn.shopify.com/s/files/1/0439/1092/2392/files/merulavafivawaposas.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dc5fa4aef0642abb8432000f11f9378.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9acda9ffa934ff98a9452f81e46c4aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd0d0913464c447e8d33514485477726.pdf
    • https://static.usrfiles.com/ugd/b8c837_efab7b681d9a43dfa11e5b6b10af5f43.pdf
    • https://static.usrfiles.com/ugd/b8c837_72115776a4274be4a9a49a3aebd463b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_06ddd9b3d677487dbfac364752f69e4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f66112757f6c4cf0823af7427c15253a.pdf
    • https://static.usrfiles.com/ugd/b6edda_cabdb3c1a53a47aea9938ccf9b6ac718.pdf
    • https://static.usrfiles.com/ugd/b8c837_e02019584a954817afa1533844b0729b.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_off00006979.bin
de95b766062b3e64674baed370f5314df9801778c605a96a76f17a61f0108d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6979 4980 bytes
font_01_sfnt_off00007a67.bin
e4676270cb479ff20cc3507b368e53026f18d08d2a330a1e1f20c37e474dc02a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A67 10256 bytes

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