Malicious PDF — malware analysis report

Static analysis result for SHA-256 0519038b74e9ca70…

MALICIOUS

PDF

108.6 KB Created: 2020-08-12 02:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75eb9a56cb8ec0d2cedac5cf14afad0b SHA-1: 65404d5562df7b1a790f43200117a8312335ab7e SHA-256: 0519038b74e9ca70e845cfde7e8c46d6b2baef95e7a24165b82c02aaeb0a8279
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=caracteristicas+aines+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL analysis point to a malicious document.

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=caracteristicas+aines+pdf
    • http://files.sidekickstand.com/uploads/1/3/0/7/130740367/givegamuna.pdf
    • http://files.designsbyshelagh.com/uploads/1/3/0/8/130874429/468421.pdf
    • http://pawuma.bbeautyco.com/uploads/1/3/0/7/130776167/piradiwezusiw.pdf
    • http://files.hatsgiving.org/uploads/1/3/1/4/131407194/8f3136ffab95c01.pdf
    • http://figota.mtnviewladylax.com/uploads/1/3/2/6/132682076/2548041.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25322908130.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7303/files/37101622063.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/62308133945.pdf
    • https://cdn.shopify.com/s/files/1/0428/2155/0247/files/selipedipumejig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/nubakof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3602/files/tazutisu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/kazeruvip.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/reravezuzarub.pdf
    • https://cdn.shopify.com/s/files/1/0439/9969/0910/files/the_adventures_of_tom_sawyer_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/nedorudumixuvajeteva.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7253/files/tibulekuxixojoxajog.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_off00016e70.bin
acb249b49b0a8a9be0c955982ff7600ac5f1f623d251c529346c6f49446c96d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E70 5024 bytes
font_01_sfnt_off00017f8f.bin
2d4d7cf398d27e5c9c7aff60d6bd084f55c9cc552ada77f53a57f17ff019927e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F8F 11284 bytes

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