Malicious PDF — malware analysis report

Static analysis result for SHA-256 1767c01c53328350…

MALICIOUS

PDF

58.3 KB Created: 2020-08-20 22:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ea31f36ceafb3c762376adaaed22437 SHA-1: 335078ec853e004d9564af4d0eaef4a4a66af0bd SHA-256: 1767c01c53328350860c7e734e777b51b0ae5dc71706a8dae94c2e0a0ce5dc7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. One such link, 'https://ttraff.com/pify?keyword=rational+exponents+to+radical+expressions+worksheet', is flagged as a known malicious redirector. The ML classifier also 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.com/pify?keyword=rational+exponents+to+radical+expressions+worksheet
    • http://fedofo.cgsparish.org/uploads/1/3/1/6/131637136/9fc6873.pdf
    • http://files.stalbanstpetebeach.org/uploads/1/3/1/3/131384101/vibisetefizugora.pdf
    • http://nedisowig.nineonefiveapparel.com/uploads/1/3/1/3/131379578/nisenakamukesolap.pdf
    • http://files.delaneygreenwriter.com/uploads/1/3/2/3/132302710/9262265.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0435/8271/8107/files/ojos_bonitos_cuadros_feos_obra_completa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1039/files/alain_deneault_mediocracy.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0902/files/tinunowixodosijazusuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/4443/6128/files/nixomekejikozopifox.pdf
    • https://cdn.shopify.com/s/files/1/0430/7809/0901/files/15747230066.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/pivapudadiviru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7150/4537/files/69571715273.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/building_construction_award.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/rujobesuzewuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/fosemekepabuzovirulera.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b7a.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7A 2828 bytes
font_01_sfnt_off0000a574.bin
afff464ddf2110ecc6902dc634581e9b13f665768d879ec97483c28a0fa53dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA574 5392 bytes
font_02_sfnt_off0000b7d6.bin
86f6d7437fa35f4fc92dec5122c74ae1cfa664d4600b638e305a31f04dd49441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 9868 bytes

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