Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0fed3f69039f23…

MALICIOUS

PDF

43.1 KB Created: 2020-09-18 00:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b38fa57522d64f5ddc27d06650987bb SHA-1: 3c0f42f768951ed9f573f52e88b1c0482b21af76 SHA-256: 0a0fed3f69039f23b210277286ecb93fd9b5dfcd85570f98fb85db1654cc0545
162 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, suggesting a lure for users to click on these links. The presence of embedded URLs and a 'download button' heuristic further supports the conclusion that this document is designed to trick users into downloading or accessing malicious 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.me/wix?keyword=plants+vs+zombies+2+apk+free+download+full+version+pc
    • http://bijiga.penicuiktabletennis.com/uploads/1/3/1/3/131383323/gujowitafuz_xujadapo_gewimijemurowi_dopomonepuwada.pdf
    • http://files.stopwrightscrossing.org/uploads/1/3/1/0/131070476/vutumojat-tunuz-vozupa-bewasavudililin.pdf
    • http://files.patriciacurry.com/uploads/1/3/2/7/132740214/e20cb54b213d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/975706468.pdf
    • https://cdn.shopify.com/s/files/1/0434/2346/5628/files/jawazemegazowapidesawola.pdf
    • https://cdn.shopify.com/s/files/1/0483/3325/8915/files/death_persona_4_enemy.pdf
    • https://cdn.shopify.com/s/files/1/0439/4778/6398/files/hallelujah_chorus_handel_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/buredajokunoloduwivenil.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/73350757819.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/34669457943.pdf
    • https://cdn.shopify.com/s/files/1/0449/8548/3422/files/wakivarupasaner.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7011/files/megiduvujuxamerel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7539/files/bijatakekukipe.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_off00006790.bin
8f849f361448a2950e2e8a315ea04595cdc2cf0161509f840e2c74fc23f1ca43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6790 5840 bytes
font_01_sfnt_off00007b7c.bin
27e83acd152ba365e79ebc652b775234dc3cf6e8baaedd8d8b6ed4365c978a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7C 10716 bytes

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