Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b7c49ea7cda71c…

MALICIOUS

PDF

44.4 KB Created: 2020-08-08 23:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61e6ad4a4fb6ce5c802e70181f48ef7c SHA-1: 56418096da0d11eb671f6327d6471dd619da4929 SHA-256: 19b7c49ea7cda71c05b5bab0a7f7f8c49198706c728340952f26367e46601ab1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=built+in+functions+in+javascript+pdf'. This URL is presented within the document body, suggesting a phishing or scam attempt to redirect the user to malicious content. The presence of numerous other PDF links, many hosted on Shopify, further indicates a link farm or SEO manipulation tactic. The ML classifier also 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.cc/pify?keyword=built+in+functions+in+javascript+pdf
    • http://files.grillo.ch/uploads/1/3/0/9/130968947/tixugovexizunivanap.pdf
    • http://vozomal.maximebc.com/uploads/1/3/1/1/131164250/2068f27d8.pdf
    • http://files.thewizardsmessage.com/uploads/1/3/0/9/130969701/6169144.pdf
    • http://files.harrisallen.org/uploads/1/3/1/6/131637108/05d14a33252.pdf
    • http://files.fuelmusicstudio.com/uploads/1/3/2/8/132815207/4300404.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/2678554669.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2777/files/48928494604.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6556/files/4856_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7266/files/xabaxeril.pdf
    • https://cdn.shopify.com/s/files/1/0435/6007/5427/files/makajuwevefosofojowovo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7748/2136/files/sri_rama_raksha_stotram_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/resmed_airsense_10_clinical_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/rafajafemevem.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/titigabibuzumazavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5306/9974/files/business_plan_proposal_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/muluwetozonul.pdf
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/20360961014.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_off00006330.bin
aa8bdaff8ddde914fb2446213c9abe9ee22b9e451db694af6977aa3864f4f4d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6330 5336 bytes
font_01_sfnt_off00007570.bin
5d59e80714f055d0e20d1c4ed594903f00ea25dd365ddc0e243c90ca16be52db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7570 2024 bytes
font_02_sfnt_off00007f08.bin
b8a9582eb11b2cb157930ce66a2e457fc6ee520e8c0dcbb8518adfe5479c0a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F08 11536 bytes

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