Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d115f0b627ec6a…

MALICIOUS

PDF

63.5 KB Created: 2020-08-25 19:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5427e51c71754afb633a93081491e67 SHA-1: ef6ebdf3e42caede1612567758ffc3c3a36b0af2 SHA-256: 17d115f0b627ec6a4a3295d685a2e119a9db639b8d57512fa80480c2ff3b9f62
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 hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to manipulate search engine results or distribute malicious content through a link farm. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate 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.ru/pify?keyword=digimon+cyber+sleuth+farm+expansion
    • http://files.kodiakteachers.org/uploads/1/3/1/6/131606758/joduvokol.pdf
    • http://files.mentorhoodmath.com/uploads/1/3/2/6/132681492/d451e910c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/90214170809.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6933/files/adrian_paenza_matematica_para_todos.pdf
    • https://cdn.shopify.com/s/files/1/0457/8974/1222/files/bhai_songs_telugu_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3997/2773/files/bmw_n52_engine.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/66174031175.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/munununexarusod.pdf
    • https://cdn.shopify.com/s/files/1/0440/4156/8421/files/data_analysis_using_regression_and_multilevel_hierarchical_models_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0379/5865/files/guitar_hero_3_pc.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8266/files/funifevoza.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/el_almacen_de_las_palabras_terribles_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4411/files/stretching_by_bob_anderson.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/css_helvetica_neue.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53522836856.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c6d.bin
f6b939cca089e987d586e5eaf73392053ae72d7e5de5fe9837c7cff3f8e68b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C6D 8556 bytes
font_01_sfnt_off0000b8e2.bin
0eda8ba576f9e49f9871d00c8a3b13d8d4c40f58a13d4358821fe41c935f1d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E2 5736 bytes
font_02_sfnt_off0000cc4b.bin
aa048245dc5f8912bb64d46ab6fdab7d5f75072aea34d7e9ee9a513c6a06c2d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 10876 bytes

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