Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8f3e60ee9a785b…

MALICIOUS

PDF

45.1 KB Created: 2020-08-31 09:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f07b9ff15ff6466ed6bd8a37025dab98 SHA-1: 71aab9ccc7e5806f362122e9064696846cd06d17 SHA-256: 5c8f3e60ee9a785b56515809df62a887ddb39e4e18394b23d0412380eb74ff4c
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is characteristic of a link farm designed to attract traffic. One of the primary links directs to a known malicious redirector. The document body, though heavily obfuscated, contains references to game-related terms and URLs, suggesting a lure to entice users to click on the malicious links. The presence of a password archive lure heuristic indicates the potential for encrypted malicious payloads.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=nds+pokemon+soul+silver
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_f84d2f88bed544ebb462f78212e9dd0a.pdf
    • https://static.usrfiles.com/ugd/b58d21_9295514f79764b56b72d47b54f837de4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4cc2e1d8739428d80427be9b2dc7698.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/goxolawozasokunupofejo.pdf
    • https://static.usrfiles.com/ugd/1decf9_ea3b22a3d4694a61907bbd11b755f27c.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_3038a5cb55764ebe9fbff21a1f589aa9.pdf
    • https://static.usrfiles.com/ugd/df73ab_b595afa7972646eab11238d7c557cf48.pdf
    • https://static.usrfiles.com/ugd/b8c837_48ef981763f14e7cb887befc3eb6581d.pdf
    • https://static.usrfiles.com/ugd/b8c837_50c2136ffa7a4ac988b5cd84905a140d.pdf
    • https://cdn.shopify.com/s/files/1/0435/3975/9263/files/boxekovovowovezi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/free_piano_sheet_music_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/am_is_are_have_has_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/mokatodad.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_off000065fe.bin
65971f24e069bb8f7840a182630267cabf19d2778f14f60c0c115f10866d5ebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65FE 4792 bytes
font_01_sfnt_off0000762a.bin
e76b201cf4edf6f042a3464604e9709e6431a6b17746f4e4e9a1c6132c5e6c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762A 10444 bytes
font_02_sfnt_off000099be.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99BE 4324 bytes

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