Malicious PDF — malware analysis report

Static analysis result for SHA-256 1423f0ec9d537320…

MALICIOUS

PDF

68.5 KB Created: 2020-08-23 09:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 063b4e476fac1820a65619ac017e7c5b SHA-1: bbb0b1df70aba35b583fb86da2d353e363544511 SHA-256: 1423f0ec9d537320bdb581a01bb413e76cea6cbeac697deb7e64a9d4cb21a0f7
162 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'home income and expenses spreadsheet'. The presence of numerous PDF links suggests an attempt to distribute or host malicious content, likely via a spearphishing attachment.

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.ru/pify?keyword=home+income+and+expenses+spreadsheet
    • http://zuted.bathurst75fc.com.au/uploads/1/3/1/6/131637830/gaminamabineguzi.pdf
    • http://files.bartletthw.com/uploads/1/3/0/9/130969971/pavofewuvakoritemil.pdf
    • http://files.tindelltraining.com/uploads/1/3/1/8/131856232/ralenijati.pdf
    • http://sutejata.michelecolettefrazier.com/uploads/1/3/0/8/130813848/tomazaso_xobibudepi_sodesed.pdf
    • http://files.xinzhangdesign.com/uploads/1/3/0/9/130969461/sidakux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/9696/9121/files/58182333448.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/7114728120.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/moment_js_format_am_pm.pdf
    • https://cdn.shopify.com/s/files/1/0437/2017/9864/files/98545485741.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/bexuxuja.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/52910651088.pdf
    • https://cdn.shopify.com/s/files/1/0429/4357/8278/files/55600669650.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae74.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE74 2828 bytes
font_01_sfnt_off0000b86f.bin
ff28108319c235869c793c5799dec207abbe87ee1de882cf18e9f86acfbf97df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB86F 5308 bytes
font_02_sfnt_off0000ca49.bin
77daa5ae03008ff775bcb07443115e6c6e58a50f941a2759f4748f89fb52e489		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 10572 bytes
font_03_sfnt_off0000eea8.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 16312 bytes

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