Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bc64066ca9aa0e…

MALICIOUS

PDF

39.6 KB Created: 2020-07-09 14:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa3ac36b8030d0b26439f7ce102c9825 SHA-1: 8cf7e46555d3f9530afb09d863eb476bdbecf54c SHA-256: 98bc64066ca9aa0ee6187bce2dd738adef935d0877f1e8863ead9eada29964a8
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The primary link, 'https://ttraff.cc/wb?keyword=baixar%20livro%20o%20hobbit%20pdf%20portugues', suggests a lure for downloading content, likely pirated books. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that this redirector infrastructure is known to be malicious. The ML classifier also strongly flagged this PDF as malicious.

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=baixar%20livro%20o%20hobbit%20pdf%20portugues
    • http://files.dorchestercuboree.com/uploads/1/3/0/8/130814124/5168523.pdf
    • http://files.clogherdonoige.org/uploads/1/3/1/4/131438570/6b49a8671.pdf
    • http://files.andrewmichaelart.com/uploads/1/3/1/4/131408529/59fa416c9cccb3.pdf
    • http://files.heartpieces.net/uploads/1/3/1/3/131379749/3776242.pdf
    • http://files.sdbvl.com/uploads/1/3/1/4/131405940/libikos.pdf
    • http://files.mountainestatestea.com/uploads/1/3/0/7/130739852/5705713.pdf
    • http://files.realfitforreallife.com/uploads/1/3/0/7/130739850/3126102.pdf
    • http://files.tezpurgurukul.com/uploads/1/3/1/8/131856176/3777112.pdf
    • http://files.buzzboxguitars.com/uploads/1/3/1/4/131437161/6418229.pdf
    • http://files.bethcaindesigns.com/uploads/1/3/1/4/131408913/ff962b708de5.pdf
    • http://files.vomhiddencreek.com/uploads/1/3/1/6/131606127/kukuko.pdf
    • https://xobaxelofutu.files.wordpress.com/2020/06/vomefa.pdf
    • https://tumukazagu.files.wordpress.com/2020/07/pekotojiwep.pdf
    • https://lamutenusut.files.wordpress.com/2020/07/29786708191.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53940500656.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vololo.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_off00005857.bin
30da2f7ea781f565e0e1dffce0079655e2b0d57ee6ae5b8788f021808970574d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5857 5396 bytes
font_01_sfnt_off00006acb.bin
84c4cdef577a8a7e8f8724478dfc22628e112200030fb30f4b7597d9ee75f8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACB 12548 bytes

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