Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6665c5710d63c4…

MALICIOUS

PDF

40.6 KB Created: 2020-08-08 04:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0c6e5cbecfbe10d033a61f57926b147 SHA-1: 11db4a7ac9b753254f74ea9ee7fab183de853d2e SHA-256: 6b6665c5710d63c46c4fc4658edb9cfc64c319265e58145d06cf1ac1d8e594c2
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure, disguised as a document about 'geographical information systems and science'. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

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.cc/pify?keyword=geographical+information+systems+and+science+pdf
    • http://files.crude-inc.com/uploads/1/3/1/8/131871569/27518a50e.pdf
    • http://files.vanessabenson.com/uploads/1/3/0/7/130775743/3058d.pdf
    • http://files.runforthefallennh.com/uploads/1/3/1/6/131607010/sevuvogakakusu.pdf
    • http://files.thomashossie.ca/uploads/1/3/1/8/131871643/c21e2a5.pdf
    • http://xibemaja.weathersteel.com/uploads/1/3/2/6/132683188/kekexotas_dalurazuk_womovokomosa_bazadafikemoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9524/4441/files/business_report_writing_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/nizagavujadijef.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/jixewutaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/40444272405.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/dizewa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/85626723715.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/fizesopuwetuvuvixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8856/7706/files/8ball_and_mjg_album.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35022180152.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4503/files/61884660632.pdf
    • https://cdn.shopify.com/s/files/1/0435/6787/4207/files/78114920831.pdf
    • https://www.cancer.gov/coronavirus
    • 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_off00005f7e.bin
61c86ea9f12524c54323d582dde0b95004c03b2fea36825ce0d4b7fea7b1d234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7E 5704 bytes
font_01_sfnt_off000072c6.bin
4f9af352fd715c382abdb868d54b79ccf9e5f6c2bed4f0449a823d64bef7d1d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C6 10132 bytes

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