Malicious PDF — malware analysis report

Static analysis result for SHA-256 1660ab78ad6b54f7…

MALICIOUS

PDF

43.3 KB Created: 2020-08-25 00:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf88de400cdd7ebf7c66a0d3b275940d SHA-1: 9cb5f0f0c7e42826dc6a6a9726dd578578b3a3a3 SHA-256: 1660ab78ad6b54f757d289115bce756bee3d878bee9c7199cb625ae517f1d8e6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm to improve SEO for malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests the primary goal is to lure users to malicious sites.

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=yamaha+emx512sc+powered+mixer+manual
    • http://files.tracyrileymusic.com/uploads/1/3/1/3/131380771/lorekem_jarowozozojixab.pdf
    • http://jupijome.bishophillcolonystoreb.com/uploads/1/3/0/8/130813834/d07e09ead.pdf
    • http://files.rowenabeaumont.com/uploads/1/3/1/0/131070051/misirolirifimen.pdf
    • http://kagoj.artscollective.co.nz/uploads/1/3/1/6/131606271/barogazuxisaxivoze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1907/4716/files/queueing_theory_in_operation_research.pdf
    • https://cdn.shopify.com/s/files/1/0447/4172/2261/files/33958918469.pdf
    • https://cdn.shopify.com/s/files/1/0438/5318/5174/files/62836016207.pdf
    • https://cdn.shopify.com/s/files/1/0440/4245/3157/files/inborn_metabolic_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/mukobixefefebidoluvevusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/55820653306.pdf
    • https://cdn.shopify.com/s/files/1/0436/5585/6281/files/alcohol_120_for_windows_10_free.pdf
    • https://cdn.shopify.com/s/files/1/0465/0870/3894/files/dataflow_report_transfer.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9127/files/79481128260.pdf
    • https://cdn.shopify.com/s/files/1/0462/2211/4970/files/baixar_melhores_jogos_de_futebol_para_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/78430976609.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_off00006351.bin
7f5207db8b11bb089b0a373af8a3fe5299f95e7b6023227350721d3b19d854b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6351 5744 bytes
font_01_sfnt_off000076d6.bin
2fbfe98f1297543204632a46258a63ecbb372af495a7d0214ad302b53e082381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D6 13164 bytes

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