Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b12eaa07a084582…

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 10:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeaf7709e3597cd007678f985b58becf SHA-1: dad83b89f5b1fb0ad39783c49e50df86d6ade193 SHA-256: 7b12eaa07a08458249b3e26ae7000aa59922e589eb7bc676dc99823765df5fe5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, https://ttraff.cc/wix?keyword=no+oyes+ladrar+los+perros+pdf, which is likely intended to lead the user to a malicious site. The document also contains a large number of embedded links to other PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier 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/wix?keyword=no+oyes+ladrar+los+perros+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/bosapavopebesilesapudeze.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/como_ser_uma_pessoa_fria_e_calculista.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7505/files/javalasadeledokepi.pdf
    • https://static.usrfiles.com/ugd/b8c837_f83e8e3d58ce4460a856622d799ad8ff.pdf
    • https://static.usrfiles.com/ugd/09273f_4ace93c8c6dc469a9d77fed1a13a9a20.pdf
    • https://static.usrfiles.com/ugd/b8c837_21f5a7f45d4245dbbc013ae55784ae18.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f625cbcf4794ec5883a050d4165a7bc.pdf
    • https://static.usrfiles.com/ugd/24853a_98d60f38f89349f4b4027942484fea75.pdf
    • https://static.usrfiles.com/ugd/0511f5_1351c31d03e840f78a1d09a6dc7cddd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_acdbb6ff422f4e5e854f4982dd587dd7.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/hospital_and_clinical_pharmacy_notes_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/98194990236.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_off00005c2d.bin
e01653cf55e034a80b1fff5eec4fca5b538c7d1acba857c52834c6ccbe559842
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2D 5108 bytes
font_01_sfnt_off00006da3.bin
aba42d039b85ec6f7e408e36c545ae5984c2eae13cde951d49f01a9be3c8abc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA3 11076 bytes