Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35da3c319534f4c…

MALICIOUS

PDF

58.5 KB Created: 2020-08-10 14:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e822d45d85d36061b8267f3d1ed9ec04 SHA-1: bfdc567e06ff09227f2b096ae601d6555abc93d2 SHA-256: f35da3c319534f4c35ea336978b6355ac2c52ce0e65e4b102e2b994bd9175fdd
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text related to '9th grade math worksheets pdf' and the URLs suggest a link farm designed to distribute PDF files. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of a phishing or malware distribution attempt.

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=9th+grade+math+worksheets+pdf
    • http://files.dropintoinfinity.com/uploads/1/3/2/8/132814071/woxakejor.pdf
    • http://riziloxo.heffnerdesignteam.com/uploads/1/3/0/7/130739267/dodufurapifunut.pdf
    • http://files.musollahsg.com/uploads/1/3/0/9/130969200/zilij.pdf
    • http://files.magiqatlas.com/uploads/1/3/0/8/130814513/zivatemurijupizowigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4127/5547/files/multiplication_bingo_printable.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/ridujuzabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/98461513369.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3569/7063/files/sunexoguvuvezaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/54507535705.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/vapuninelobezawilodine.pdf
    • https://cdn.shopify.com/s/files/1/0440/7823/5798/files/what_is_an_example_of_ethos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/wovuzogowigujirekipir.pdf
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/definition_of_artificial_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0440/4979/3174/files/5738403339.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bd5.bin
4cca465461607dd4e0550e0f4d7890b08927df04b0a71551fc803654f332a0fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD5 5640 bytes
font_01_sfnt_off00008efd.bin
43d3dc35fac3cbb87bee9e3a39c9b3c65790059e51ddf3400f165f04894b88c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFD 2536 bytes
font_02_sfnt_off000099de.bin
c1046a2362d082a9c7a89147259410c82e5beb3aa9dde8475721726a5627c3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99DE 14628 bytes
font_03_sfnt_off0000c789.bin
dc93e5052967703781f51559141dcf01c1fc37406ee72b563c21c85f67410e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 16096 bytes

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