Malicious PDF — malware analysis report

Static analysis result for SHA-256 5825053bd3096d32…

MALICIOUS

PDF

39.6 KB Created: 2020-08-12 17:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec63abd4ad5ca641f11da6f2edc8aa27 SHA-1: c1fc3c7c3ec34894f91343f829bfd7e16f76e72b SHA-256: 5825053bd3096d3257463bb197deb75550209e422e9d36ba7f05f5de6ba8bf28
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body also contains this URL, alongside text related to 'Adobe PDF reader download', indicating a social engineering lure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm used to distribute malicious content or improve SEO for malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=adobe+pdf+reader+download+softonic
    • http://files.pictonlittletheatre.com/uploads/1/3/1/4/131453402/nafasaxujofusaj.pdf
    • http://files.bigsforkids.org/uploads/1/3/0/7/130775605/0d82a4e06193.pdf
    • http://files.theelementsexchange.com/uploads/1/3/2/8/132814898/aaa725.pdf
    • http://files.ioliteraryjournal.com/uploads/1/3/0/9/130969480/3765d30e211f.pdf
    • http://files.drumsa.org/uploads/1/3/2/7/132710694/gunimosokif.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/23706553966.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/dusulinefotodanel.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/jagarodutedexatolofurezob.pdf
    • https://cdn.shopify.com/s/files/1/0428/8859/3567/files/dipadegofuwivasupakiva.pdf
    • https://cdn.shopify.com/s/files/1/0446/1549/9939/files/qaseeda_burda_sharif_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/xupuberamamupaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/kexuxurivejeke.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/38771728404.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/auditor_independence_chapter.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0261/files/preschool_activities_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3381/1351/files/wordpress_search_shortcode.pdf
    • https://cdn.shopify.com/s/files/1/0433/0124/0985/files/aircraft_electrical_and_ignition_system.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d29.bin
cb5c13a267b26b76bb95f275869c69921c758dddc221a1706bffa29d9ac85d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D29 5372 bytes
font_01_sfnt_off00006f82.bin
9a4a2216f04c5d65e1880a3729fd33c017311ec68f0f7c82d2e582f1e7bc24b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F82 9992 bytes

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