Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a92ee95a9998e26…

MALICIOUS

PDF

39.4 KB Created: 2020-07-12 03:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3458bc3878da19f286dab8da6f68e517 SHA-1: 745f369ca48d180f9a8ab1d41209220ab9528d32 SHA-256: 1a92ee95a9998e266a7a1c75f0d8bac134cf6b5da53c997abc6b955de3dccd65
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary payload delivery mechanism. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting an attempt to lure users to malicious content under the guise of educational material for preschoolers.

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=porras+para+ni%25C3%25B1os+de+preescolar
    • http://files.orangehistory.org/uploads/1/3/1/3/131380998/6a7d3c8e67aa6.pdf
    • http://files.condzellasfarm.com/uploads/1/3/0/9/130969555/97c8dd5b0b0479.pdf
    • http://files.planninginblackandwhite.com/uploads/1/3/2/7/132710655/bobuzugipiz_renele_litazafurusagop.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/labobosufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/guwesiwegosajewesujagejop.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/83273441923.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/56680524763.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/18917071427.pdf
    • https://netuvujon.files.wordpress.com/2020/07/49438450515.pdf
    • https://fewiveke.files.wordpress.com/2020/06/67775320862.pdf
    • https://jiruxoti.files.wordpress.com/2020/07/bomevugovibafitubi.pdf
    • https://begaxanup969609704.files.wordpress.com/2020/07/porojipekakejugifi.pdf
    • https://kukodojepi.files.wordpress.com/2020/06/92719632437.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/nejopufodozunarabarulafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/zubuze.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/retigirukanel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86399573169.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b50.bin
c47761a4c52c4efd813fb5dfd1cd4133acb37dc9150013a66315b2896317d3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B50 4988 bytes
font_01_sfnt_off00006bf2.bin
0d73bed7eb319b63afb937301a5ac882863b00724a53d7ea02dd433fb54f682e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF2 10684 bytes

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