Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43bbe7bc26b044e…

MALICIOUS

PDF

47.5 KB Created: 2020-08-11 13:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a1b431c9209076f96360a415e5be40c SHA-1: 0195a040a7427725ba3665972d4c7a931c8434d3 SHA-256: c43bbe7bc26b044e69701bd7dae771e3967dae22520cac69c4a9f659950e80c9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the text 'Tamil calendar january 2020 pdf' and the malicious URL, suggesting a social engineering lure. The presence of numerous embedded URLs, many pointing to Shopify domains hosting PDFs, indicates a link farm strategy to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=tamil+calendar+january+2020+pdf
    • http://mujiwojut.pieintheskystjohns.org/uploads/1/3/2/6/132681556/adbdcd27.pdf
    • http://files.dancingjewel.com/uploads/1/3/1/1/131163914/952bf1ac2.pdf
    • http://files.savouryspoon.net/uploads/1/3/1/4/131438329/55de2.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/53521477777.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/84254645608.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2069/files/34087783710.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/xuxesibe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/megepejanakigefemexab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8437/files/40657063839.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1095/files/miopia_e_atropina.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/4266824115.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/11675956144.pdf
    • https://cdn.shopify.com/s/files/1/0434/6200/0806/files/judirudomosizerowitixalew.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/xiwuzam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0999/0043/files/allama_iqbal_open_university_admission_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0667/2546/files/20491920050.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/4007115425.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/
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/f

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004eba.bin
127915529057bf829baf632e8b341b729e7302f9aa2ec7eaf8d6a9caa5555a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBA 5216 bytes
font_01_sfnt_off00006053.bin
f747eae70b613a7addfe878d940650e583504124e476350495eb712ecf3e0446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6053 3024 bytes
font_02_sfnt_off00006b81.bin
869522bc5c0a4f72d49d2d086921cecf8ca48a4186275b388fa5f1dbd2d308ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B81 9764 bytes
font_03_sfnt_off00008d2e.bin
5d52f40a13f54bcc329d29992e3abd0fd28294c8bc547691d9075fb1d42365f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2E 16076 bytes
font_04_sfnt_off0000a1d3.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D3 4324 bytes

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