Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8ba840441838e7…

MALICIOUS

PDF

40.5 KB Created: 2020-08-14 11:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bbc3aa1cc52df78d484c3cda8922421 SHA-1: c63e1cde8d4019b152226fcabe49e6bf7a52024b SHA-256: 5f8ba840441838e7f44ee9a0afb610bb38034ada92ccd3bd3c01ba06a05e4fc0
154 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, ttraff.com, disguised as a weather report. It also hosts a large number of other PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=badrinath+current+weather+report
    • http://files.sechotech.com/uploads/1/3/0/7/130739835/c8fe0aa5.pdf
    • http://files.aeta.org.au/uploads/1/3/2/7/132740814/9093068.pdf
    • http://files.beckyjonesart.com/uploads/1/3/1/3/131383456/vunevoba_bupulelezowasof_vixopiwigivavun.pdf
    • http://neredatuj.expressyourselfiepb.com/uploads/1/3/1/3/131380213/3455200.pdf
    • http://files.blackngreenphd.org/uploads/1/3/1/3/131380688/sajijomulele-lafug-dagafevemope.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5907/5477/files/rerunidamiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5586/4213/files/laruzozexanatewewewef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5625/0525/files/48699316956.pdf
    • https://cdn.shopify.com/s/files/1/0432/5012/2916/files/499413792.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8682/files/67775097913.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/53769937433.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/bodutisej.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/nitrogen_cycle_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/sewing_patterns_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/wedadubog.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3462/files/piwexutepimolagemufipuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0973/5845/files/pobijepobofiketimepidubev.pdf
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/reflection_across_the_x_axis.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_off0000614f.bin
dec6dc7e4382a99f7d7056e75663b437e79bd5df2b84a3cc8239a14530f8edb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614F 5092 bytes
font_01_sfnt_off0000729e.bin
641eca01ae3b467faaa7c2116fe8e6957351b74a6be1cc92fb4f92ff49f90081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729E 9944 bytes

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