Malicious PDF — malware analysis report

Static analysis result for SHA-256 023a449d287db58f…

MALICIOUS

PDF

39.2 KB Created: 2020-09-04 02:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a61a114d7e388fa6e269ab3c965c9c4a SHA-1: 289f4092625ea7af633d84c78d75d8384dff7099 SHA-256: 023a449d287db58fcdb2ab0e0aea66b68204ea552a216eb399246612bc317146
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'excel 2013 vba protect sheet with password'. This, combined with the 'Password-protected archive handoff' heuristic, indicates a social engineering attempt to trick users into clicking the malicious link, likely to download a payload or visit a phishing site.

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.club/wix?keyword=excel+2013+vba+protect+sheet+with+password
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f6a907_91ece96e544349dab848babc35963511.pdf
    • https://static.usrfiles.com/ugd/a298ce_743726fb998b466a94f68aa5e88d76a9.pdf
    • https://static.usrfiles.com/ugd/b910ae_206e0e9866b84df2bb2d293c466d1efb.pdf
    • https://static.usrfiles.com/ugd/b28ae2_51c629047acd4ec39dabcffe2c0b8d4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_03be4575ee3648818c565a283653d3cc.pdf
    • https://static.usrfiles.com/ugd/45fd81_980d864d02a04157984e72cab7ec116a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6fff296eabc47b6a2a84be79ee9b104.pdf
    • https://static.usrfiles.com/ugd/0d9a50_d9bd076ec07c47b6900228ac0cd8b9ea.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_0963558ab5524e45858dfee4c437ef7d.pdf
    • https://cdn.shopify.com/s/files/1/0462/8483/2928/files/cranberries_zombie_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/39101361067.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/wadaxizonoxelukag.pdf
    • https://cdn.shopify.com/s/files/1/0435/4975/3493/files/fashion_flat_croquis_template.pdf
    • https://cdn.shopify.com/s/files/1/0454/6166/7992/files/balance_ball_computer_game.pdf
    • https://cdn.shopify.com/s/files/1/0466/8552/0036/files/11539425682.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/padefodejob.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_off000059ef.bin
ca1412a3d33df1a6a391c2b177fafd6289ed97419c4f6dd47b5fa3f58509ca8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59EF 5968 bytes
font_01_sfnt_off00006e51.bin
2ff3c737da2ccda10c731a3f16bdcd1db80568c11ff315ad58cbf07ff73e8619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E51 9780 bytes

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