Malicious PDF — malware analysis report

Static analysis result for SHA-256 795d456d5c6b6b38…

MALICIOUS

PDF

74.5 KB Created: 2020-08-30 12:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76d52249cda58162e72bee5f1f11a254 SHA-1: b1a4fca166c7c52357717bda83f50dfa25f82155 SHA-256: 795d456d5c6b6b388226cd7c9ee6db9230aef95d83c2b999b9325c821c0d7ece
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.com/wix?keyword=la+pelicula+de+scarface+tony+montana', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the redirection attempt.

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/wix?keyword=la+pelicula+de+scarface+tony+montana
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_49773783d9b1483f950c79338b3366ba.pdf
    • https://static.usrfiles.com/ugd/c5d40f_d8594b43d2964a069a05a94deaad3c14.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d24675b4c5149198d1408813808f92c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca669c5e18164dc7b1772e1030984331.pdf
    • https://static.usrfiles.com/ugd/696b8a_d8e4ee83d2274984865d89177f99c554.pdf
    • https://static.usrfiles.com/ugd/d5415a_81cbbdd88ce74d04844cee0ebdc5b764.pdf
    • https://static.usrfiles.com/ugd/b8c837_15905acc585e43af92e417bf7040f5e7.pdf
    • https://static.usrfiles.com/ugd/accd1f_785dff3e648946a6bb125198af69de5c.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_a1f26bc8a7cb4d9da55785c6d34e94bf.pdf
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/39634409528.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/8917099578.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/33479006095.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/formule_apertura_lettera_informale_inglese.pdf
    • https://static.usrfiles.com/ugd/b8c837_f700d46583144fc38939bec58969a510.pdf
    • https://static.usrfiles.com/ugd/b5aed9_388209cd7c494957a8b97b74213d2b16.pdf
    • https://static.usrfiles.com/ugd/b8c837_38493757649841c7a5b34681288a6b9c.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_off0000e19c.bin
c81161be6eebbad7bd7b499d48f76d84dd8a2421995ae330e4233b99ce510422		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 5344 bytes
font_01_sfnt_off0000f3bb.bin
7892b15dbdfa53318e2b6bd50c92989da9b25b623fd81fa08fec35b3c23dded8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 12000 bytes

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