Malicious PDF — malware analysis report

Static analysis result for SHA-256 1107bfec7a4d7ceb…

MALICIOUS

PDF

44.3 KB Created: 2020-09-10 09:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fb38f909876f824ae00e91beded17be SHA-1: cf3369f931749b14dc3bec25c04e2c72dea57a9b SHA-256: 1107bfec7a4d7ceb896b672a338b60981028960ee3e4bd6b78b313dab9923071
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to redirector infrastructure or potentially malicious content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

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.link/wix?keyword=vcds+mobile+software
    • http://kotoroj.meghanfialkoff.net/uploads/1/3/0/9/130969030/muramiwesilunesuju.pdf
    • http://files.aftdoc.com/uploads/1/3/0/7/130739772/xipuxulizap.pdf
    • http://files.edtechrodgers.com/uploads/1/3/2/6/132695213/4687289.pdf
    • http://fusukako.mcnamaragypsies.com/uploads/1/3/1/4/131438500/f1410b439a3.pdf
    • http://files.teesdalechallengewalks.net/uploads/1/3/1/3/131379343/6f2ba14b7446.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/338562_75094ef6d32a48c99f4312ad93e063fa.pdf
    • https://static.usrfiles.com/ugd/a18aa6_dfc5e316e4ff4b4ea31e15a76ac47325.pdf
    • https://static.usrfiles.com/ugd/0c60a0_07e7004e90cb49caaf1bf148610752a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_271090167dc04bebafb0337794bf4f64.pdf
    • https://static.usrfiles.com/ugd/d94ae5_0804c158d472415b8a1d7bc56c2c567f.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/san_andreas_mod_intaller.pdf
    • https://cdn.shopify.com/s/files/1/0431/5499/7402/files/5940635172.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/84985690103.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_a2e3311458ba4e6283fa1abab66cea13.pdf
    • https://static.usrfiles.com/ugd/15ebe2_d84f44151ac247688103e3e2caff4f46.pdf
    • https://static.usrfiles.com/ugd/0049ca_0495a3cb1531453f8a96669400aadfb4.pdf
    • https://static.usrfiles.com/ugd/3649d2_4f53ddef36d14ffd9a8bc9c08ff30f67.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_off00006c2b.bin
dfe9f441d41b3c8dc27f1be9486d2640ff3fd024c897e9fdbe10c606da81919e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2B 5364 bytes
font_01_sfnt_off00007e67.bin
594a07e9b08bfd34f41048288da215753108ae45f4799c5d0f202f1bdbfcf24f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E67 10724 bytes

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