Malicious PDF — malware analysis report

Static analysis result for SHA-256 01520c9bbaecde2e…

MALICIOUS

PDF

39.7 KB Created: 2020-08-11 15:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86a6632844279263945aa4ec948dc3fc SHA-1: 3406e5f25e7f8b2321cb3ec1fc3a96a8d91ac195 SHA-256: 01520c9bbaecde2e1c555fabf867852789092cd0adf8aa35af497874ee9573fa
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link to a redirector hosted on 'ttraff.com', which is flagged as malicious. The document body and embedded links suggest a lure to download a chemistry paper, but the primary link leads to malicious infrastructure. The presence of numerous benign-looking Shopify links is likely a tactic to obscure the malicious redirector among legitimate content.

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.com/wb?keyword=ntpc%20chemistry%20question%20paper%20pdf
    • http://files.2020parkvision.org/uploads/1/3/1/3/131383444/3866905.pdf
    • http://files.redwoodsafety.org/uploads/1/3/1/3/131380263/padiwad_jozejikonowip.pdf
    • http://files.kbayathleticclub.com/uploads/1/3/1/4/131409009/gedojolujavavunurofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/metabolic_confusion_diet_plan_easy.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7067/files/module_8_basic_aerodynamics.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/musutewep.pdf
    • https://cdn.shopify.com/s/files/1/0430/8176/0935/files/nokibilederoralerewijujim.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/compressor_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/4452/8550/files/a_book_apart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14192803693.pdf
    • https://cdn.shopify.com/s/files/1/0448/1748/1888/files/cambridge_international_as_and_a_level_physics_2nd_ed.pdf
    • https://cdn.shopify.com/s/files/1/0432/0614/8255/files/bavowefufakutugod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/kokujem.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/jutedowebekupimavaruzona.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_off00005c90.bin
8bf627356beeace2e4f3968c379215e81dab943dd082133f291bb81302819767		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C90 5560 bytes
font_01_sfnt_off00006f5c.bin
ca8eedb035fb077cdcbb5641455b94081868d457bedd6b457fae35b87353db98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5C 10084 bytes

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