Malicious PDF — malware analysis report

Static analysis result for SHA-256 557c5e3ffe858323…

MALICIOUS

PDF

38.2 KB Created: 2020-09-05 07:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 390501b9a3816daa1ffe750daa0538a5 SHA-1: 3424f5a6fe489767b40c6d4faa963b8fa7b29080 SHA-256: 557c5e3ffe85832370bd2eb3b350e8c8c934fcbf3085d5a5ef20bfeadd201342
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure for a 'brick breaker game apk', which is likely a pretext to drive traffic to the malicious URL. The PDF also contains a large number of external links, many pointing to benign Shopify URLs, but the primary malicious link is the most concerning.

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.me/wix?keyword=brick+breaker+game+apk In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/konemisusejiloxaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1313/5774/files/lifimefaxaweliravozus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8466/1407/files/minecraft_medieval_farm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5397/9550/files/medical_cases_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/xolawadanolezovififa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0378/8960/files/best_money_management_apps_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/76301223879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6300/0736/files/car_emi_calculator_excel_sheet.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b56239_f60a2573cd22496191deb1e5bbf57d95.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9df9d6_ee34ee825b634c2ca720b91eb3a0d25d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d43733_42149471969e4b33bad477289ec0d4ab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3990/6197/files/34369969281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/mario_kart_wii_mods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8370/1155/files/cmv_esophagitis_treatment_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7727/0678/files/rixunikowafabudebasar.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56DE 5296 bytes
SHA-256: 1e13751a1db2585ea65bd51ca07e2b276012e38b1373e22f6ce805199ecd0af4
font_01_sfnt_off000068d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D8 10280 bytes
SHA-256: e00964b0f010601ca2d108a6475209d6909676dbdd2679c0709a272aadd5df7d

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