Malicious PDF — malware analysis report

Static analysis result for SHA-256 498ef8c7b5532dbd…

MALICIOUS

PDF

49.2 KB Created: 2020-10-30 12:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7085654d5c867838f46f782560ab6d46 SHA-1: 5961330a16a2393b4ebb9813b38c320ef89f6bbe SHA-256: 498ef8c7b5532dbd4113097e06bb7488567006163881ac11eda993c1dd29c873
162 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'voting guide' and embeds a link to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=willamette+week+voting+guide+2019
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f8bad6d3d008.pdf
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f86fb2d4b4f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0502/3042/7817/files/sirajakaguvipel.pdf
    • https://uploads.strikinglycdn.com/files/a8bcca75-1fa2-48e8-8032-9be96f847baf/xoxonegidotorid.pdf
    • https://uploads.strikinglycdn.com/files/60ad401a-a849-4a4f-92d2-bfb01bcc8a04/expert_python_programming_3rd_edition.pdf
    • https://uploads.strikinglycdn.com/files/101fe2db-09ec-4c01-b7e1-0a48d0eeb211/muzopanikotasu.pdf
    • https://uploads.strikinglycdn.com/files/8c2f8534-75f1-4720-9cb9-f50d2b1688ad/82213823266.pdf
    • https://uploads.strikinglycdn.com/files/3706f2d4-1358-4381-bd78-a3425583e28d/5517408616.pdf
    • https://cdn.shopify.com/s/files/1/0432/8810/1030/files/sutix.pdf
    • https://cdn.shopify.com/s/files/1/0430/0354/3715/files/tovena.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/value_proposition_design_wiley.pdf
    • https://cdn.shopify.com/s/files/1/0437/1926/2363/files/importance_of_water_supply_scheme.pdf
    • https://cdn.shopify.com/s/files/1/0498/0965/3914/files/nevirapine_package_insert.pdf
    • https://uploads.strikinglycdn.com/files/3876ed44-88c0-4c3e-a51f-99341e820347/pejuwe.pdf
    • https://cdn.shopify.com/s/files/1/0500/1048/9024/files/e_o_wilson_sociobiology_the_new_synthesis.pdf
    • https://cdn.shopify.com/s/files/1/0478/2329/0527/files/descargar_sonic_unleashed_para_android_apk_gratis.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_off00007162.bin
8dd23ee5089d7bfd40367ab94cab6bd9e1d9aa3c802ece6c491b39c006112fc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7162 5464 bytes
font_01_sfnt_off0000840b.bin
e4bc210218573d0804fcba6860f1f108185e45421ffbee47b89a6718526b21be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840B 10960 bytes
font_02_sfnt_off0000a97c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA97C 4324 bytes

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