Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae95dcf0f8f7fa3…

MALICIOUS

PDF

42.6 KB Created: 2020-07-09 02:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 355b3cdc648837c8e0faecf51ed52894 SHA-1: bafeb82a6d6a55293a005dcea031aee891e872eb SHA-256: 1ae95dcf0f8f7fa326dd373b4790077a380cccc9311986ec0f348d726527af1f
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, forming a link farm. One prominent link redirects to a malicious infrastructure at 'ttraff.cc'. The ML classifier strongly indicated maliciousness. The document body, though obfuscated, contains the primary redirect URL and references to PDF downloads, supporting the lure.

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/wb?keyword=harmonielehre%20im%20selbststudium%20pdf
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdf
    • http://files.carolynburkestl.com/uploads/1/3/0/8/130814342/wewasuruxegate_lufuza_tozijizavesifu_sofogaxeb.pdf
    • http://files.digitalanodyne.com/uploads/1/3/1/1/131163910/wajutib_vagoga_legidigezesa.pdf
    • http://files.mcnairycountytn.org/uploads/1/3/1/4/131407857/8efacbbf.pdf
    • http://files.junglingworks.com/uploads/1/3/0/7/130775561/190d62.pdf
    • http://files.evanscountyhistoricalsociety.org/uploads/1/3/0/8/130814529/32317d618.pdf
    • http://files.primmenterprises.com/uploads/1/3/0/9/130969865/povikidepebunemafuko.pdf
    • http://files.eternalrulers.com/uploads/1/3/0/9/130969663/aef7e3816d0366d.pdf
    • http://files.parkhillbowlingclub.com/uploads/1/3/2/8/132815154/4047543.pdf
    • http://files.haciendasonoma.com/uploads/1/3/2/7/132740218/7130198.pdf
    • http://files.minpaa.com/uploads/1/3/2/6/132681450/452153.pdf
    • https://fukigus.files.wordpress.com/2020/07/zupudu.pdf
    • https://kozaxijewob.files.wordpress.com/2020/06/wukamagejugol.pdf
    • https://lasewodaba.files.wordpress.com/2020/06/xirimejegifujanixi.pdf
    • https://watodel.files.wordpress.com/2020/06/32568711424.pdf
    • https://nasurigafu.files.wordpress.com/2020/07/rojilu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.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/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000662e.bin
100cbef8db50d07057af8439ffd1f458bdf959be82f4a2f7cc709d1032078be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662E 5264 bytes
font_01_sfnt_off000077cd.bin
f95a7c1c7312a0066208526f8f049e27358c1c7ece37bbe142230cb2a9c99053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CD 11312 bytes

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