Malicious PDF — malware analysis report

Static analysis result for SHA-256 507f82c723a582d2…

MALICIOUS

PDF

37.9 KB Created: 2020-08-13 18:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b4542a08e18d5f4b29ed7478e6a6fa SHA-1: 726bd7fcc834ca3319888ccfe5fa244f3b748a66 SHA-256: 507f82c723a582d22a1915a0f818d934c85c28b32aac18f05ae3fb5323d01f50
152 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, masquerading as lecture notes, to a known malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=irrigation+and+drainage+engineering+lecture+notes+pdf. The document body itself is heavily obfuscated and contains embedded URLs that point to benign Shopify domains, likely used to mask the malicious redirector. The ML classifier 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.com/pify?keyword=irrigation+and+drainage+engineering+lecture+notes+pdf
    • http://files.swaintaekwondo.co.uk/uploads/1/3/0/9/130969085/laval.pdf
    • http://podiz.luminous-studios.us/uploads/1/3/0/8/130874075/jozesaporejonezenega.pdf
    • http://files.milliontreeinc.com/uploads/1/3/0/7/130739783/deleradexofegaw.pdf
    • http://files.southribble-greatwar.com/uploads/1/3/2/3/132303035/binuxigukapola.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/building_construction_principles_practices_and_materials.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/rafamidogo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/sabosatil.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9013/files/fuwanikotenosus.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/hotel_asset_management_principles_practices.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/gusugoseg.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/53757955077.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/26074135295.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/abstract_algebra_an_introduction_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/jepiwizafowemeserub.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/kiwemotavedakowewadunam.pdf
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/general_mental_ability_and_reasoning_syllabus.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_off00005722.bin
397756ee7243bc1c474ee872f36b874c93de104788ddeb7fb854974b0fe25bee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5722 5260 bytes
font_01_sfnt_off00006908.bin
6266af3f44033c06766830f2dba52dd1a13d260b8c8c95edad119dbe232b0a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6908 9784 bytes

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