Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af971fd21dc75dd…

MALICIOUS

PDF

70.0 KB Created: 2020-08-31 03:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f9a0615fe9ac2198c4658db126321e7 SHA-1: 15de1838abed7858dab3ccc917b449d6602cd22b SHA-256: 6af971fd21dc75ddaefae103cbb194c40e5f12ceb85e07d89c9428af2ba1c543
262 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document employs a link farm and SEO lure technique, embedding numerous links to other PDFs, likely to improve search engine rankings and trick users. One of the primary links directs to 'https://ttraff.ru/wix?keyword=sam+broadcaster+4.2.2.rar', which is identified as a malicious redirector. The document also contains instructions for a password-protected archive, a common tactic to bypass security scans. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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
  • 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.ru/wix?keyword=sam+broadcaster+4.2.2.rar
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/neniwutubivumowiweruzoni.pdf
    • https://cdn.shopify.com/s/files/1/0437/8250/4600/files/oracle_sql_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/wopebodawumala.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/galunapenel.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/55388413605.pdf
    • https://static.usrfiles.com/ugd/1e32c2_83771df8dc354c018cdc117928cbd166.pdf
    • https://static.usrfiles.com/ugd/f0f215_61cb9aaff39e4198935e8d1519a0f06f.pdf
    • https://static.usrfiles.com/ugd/df4650_2f26aba6a0a147d28728e58e7c2cc217.pdf
    • https://static.usrfiles.com/ugd/078c79_ac08041b0c5042b8bebc489d6cff45ae.pdf
    • https://static.usrfiles.com/ugd/0aab01_056686bcdb854dedb60965516e7d663e.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_9bc56767ad654881bb121cd42c15fd37.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/aplikasi_adblock_plus_untuk_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7566/files/app_airdrop_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/2140/1237/files/36227895590.pdf
    • https://cdn.shopify.com/s/files/1/0435/9458/0136/files/vocational_assessment_report.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_off0000cf52.bin
03a235c2f98fe8c50af0f3e89a73aa2e03434029148393eb093f7a544cc55405		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 5548 bytes
font_01_sfnt_off0000e21f.bin
1d1b72d89ba8afdedc1979cf9fb65919264c97a0ce5e69601fe9b36863865b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 12420 bytes

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