Malicious PDF — malware analysis report

Static analysis result for SHA-256 763f833008ae8be2…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 08:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6444280b2bcb74d9f441869c9f75aa0 SHA-1: 9a7bd258b6ed853e51385dbb51d95c7bb6134372 SHA-256: 763f833008ae8be22cd6c7976974b200d4b453111223cab14e4af4577b97e604
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, functioning as a link farm. One of these URLs, 'https://ttraff.cc/wix?keyword=kill+la+kill+fan+art', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains a mix of seemingly random characters and URLs.

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/wix?keyword=kill+la+kill+fan+art
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/756799_150992ed334b49c8aa7c66d6f176ca62.pdf
    • https://static.usrfiles.com/ugd/7d21c0_af17295077ea451ea197a03e2f20d9e8.pdf
    • https://static.usrfiles.com/ugd/48f461_31478c5f97c64908bf648a01878ff8f1.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/sidezenapinomemakizejaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/8722/3198/files/australia_states_and_capitals.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f97c5c31cb742a8882788688bd596b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_166c583fa7264da5955d4ece513af4a4.pdf
    • https://static.usrfiles.com/ugd/de65f7_493206a8c6ba46ca8f83965cad10dc6a.pdf
    • https://static.usrfiles.com/ugd/edb4a7_100c9368e81447e281cb381ed3d7a1dd.pdf
    • https://cdn.shopify.com/s/files/1/0438/3703/0560/files/articles_grammar_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/4380/5594/files/curar_el_bruxismo_de_forma_natural.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/80113190781.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/xawurukonoxuwilelupusej.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/nejirabapavogorazul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070c6.bin
92af4a2864d1ef14fdff7d3c8cadeefdf1a4e11b2abe17bae96f4123e36788ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x70C6 4616 bytes
font_01_sfnt_off00008083.bin
08dcc56e85d56bcac7d15ce65829119097779f871da099c7fee7b484656276f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8083 10304 bytes