Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1433811d82a0c1f…

MALICIOUS

PDF

38.0 KB Created: 2020-09-17 21:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b9934f0dc714cf6f761c10ca0d29d9c SHA-1: 277978753924c55965ed1b764b3f94aa2df245ae SHA-256: b1433811d82a0c1f56170c8cb6ba1c67e516318cea36b7a92a00e69b81c144ed
154 Risk Score

Malware Insights

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

The PDF file contains a lure disguised as a worksheet with answers, directing users to click a link. This link, 'https://ttraff.me/wix?keyword=lab+equipment+identification+worksheet+answers', is identified as a malicious redirector. The file also contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. The ML classifier strongly indicated maliciousness.

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=lab+equipment+identification+worksheet+answers
    • https://ca3c9c3b-f2af-44a1-acad-a5d97f33b5e1.filesusr.com/ugd/b50c55_5a98583f8f9f469fac1aa74fb9558359.pdf?index=true
    • https://39f125fc-6f26-4886-8472-bf6b40486a76.filesusr.com/ugd/132250_98bc514d51b4411c85230662c0fa0953.pdf?index=true
    • https://7a11ab84-cadd-4d32-bc38-de7d67d7b620.filesusr.com/ugd/7be1cd_539f6580d45c4c4d89b106a599172127.pdf?index=true
    • https://f092bec7-e105-4e44-bf20-fd1eeb3e23a5.filesusr.com/ugd/3ed902_2a3d1838a4b74895b3e579fa5df878be.pdf?index=true
    • https://2c4c2c48-ad14-4cf0-a3fa-d985751ee8fe.filesusr.com/ugd/5c9621_8006ffa5e9e04686bfcd0d056d0268ba.pdf?index=true
    • https://1b4c3e9c-f4df-4783-8a30-991fe92dcbb0.filesusr.com/ugd/db93e9_13ecd1359670440fa71e05e641c76ae5.pdf?index=true
    • https://1edfb198-1476-4d74-8e12-d85b8c31b285.filesusr.com/ugd/735424_1778e5e1adcd4002b3ec406e6e9b3d84.pdf?index=true
    • https://5c075c3e-7cba-45a1-97ae-9410263cdcd8.filesusr.com/ugd/96768c_14bbf9b02d944cd1b63853bf0942f598.pdf?index=true
    • https://c9ae4b2b-c7e0-4fc7-93b8-88144ccf85ff.filesusr.com/ugd/529385_5d47d156ad8f4ec890d278335244e5bf.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/64981725153.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/94318464582.pdf
    • https://cdn.shopify.com/s/files/1/0438/0521/2832/files/cara_menggunakan_breast_pump_manual_pureen.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/34588102835.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8892/files/bepopomem.pdf
    • https://0babe8bc-840e-4d9b-8925-81abe83498ce.filesusr.com/ugd/c068f8_de4444df138148dc975d67c33f0dfef7.pdf?index=true
    • https://b2fe6e70-4b8b-4068-8714-c3741883005c.filesusr.com/ugd/225520_c43351a19d67428aa0a05f0e49af66a6.pdf?index=true
    • 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/
    • https://b2fe6e70-4b8b-4068-8714-c3741883005c.filesusr.com/ugd/225520_c43351a19d67428aa0a05f0e49

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005542.bin
9b4ae84ff2d6525a5d47865740b1775174f664b77523af5005285a507682b40e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5542 5724 bytes
font_01_sfnt_off000068a4.bin
6754c99b99373444dec1f09d2e71f3c25f52efa8025fcd4bba6902e602bbfebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A4 10064 bytes

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