Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3688f09918240c…

MALICIOUS

PDF

36.2 KB Created: 2020-08-13 07:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2b6b0f564c8deb120699c45c4b2b473 SHA-1: ec02c20772257ae14d300c1bf06effae3a8a70eb SHA-256: 0a3688f09918240cfc43ca26285819bbc9a6d797407e56e1154c4bdfedf99d17
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a link farm designed to redirect users to potentially malicious sites, as indicated by the critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though partially corrupted, suggests a lure related to a worksheet answer key, aiming to trick users into clicking the embedded links. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=landforms%20and%20bodies%20of%20water%20worksheet%20answer%20key
    • http://files.woodlandharvest.org/uploads/1/3/2/6/132695325/1076142.pdf
    • http://xomujo.flagsnmore.com/uploads/1/3/1/4/131407005/vuvexovoz.pdf
    • http://files.northcentralcivitans.org/uploads/1/3/0/8/130814208/5b7a4c4a71f9374.pdf
    • http://vefenu.milliesjumps.com/uploads/1/3/1/3/131383483/febidoz.pdf
    • http://files.namiramseycounty.org/uploads/1/3/1/8/131871921/mivebalufudurip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7311/7086/files/penguin_books_level_6.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/2412483736.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/form_il-_941.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/mutamejinigasoramufinileb.pdf
    • https://cdn.shopify.com/s/files/1/0436/7322/3321/files/gipinugexep.pdf
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/poditazijopadepovotil.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/possessivpronomen_bung.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4917/files/carte_du_monde__imprimer_format_a4.pdf
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/xonarelivijira.pdf
    • https://cdn.shopify.com/s/files/1/0431/3710/6087/files/the_art_of_seduction_review.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/14983461899.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_off00004fdd.bin
3152e27b5f57f9ccd66324a5abd7c7802e61509cbab0364354f46080fc4014be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FDD 5452 bytes
font_01_sfnt_off00006259.bin
bcb0c5c9dbf1fd42dd4d6c4e6adc48f8ee8085acb01f9c3536b4424a17cb8f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6259 9880 bytes

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