Malicious PDF — malware analysis report

Static analysis result for SHA-256 7914661a952c05db…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 21:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dcc79bd9e93cfbe2a0273e6c683a57c SHA-1: 003922c5862a466fe39aaf2765013d151a80b3ec SHA-256: 7914661a952c05dbfa2a935defd485c2122ad5b5baf92815db3acc857e035683
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 a redirector infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or 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.cc/wix?keyword=lisa+valdez+kitaplar%25C4%25B1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/599f1c_06112df4c19b4c81b7cc3334276c79ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_40b0e2f330ed48b687c04fd0fa65e47c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0456f83b53964426a41325bac41d8f95.pdf
    • https://static.usrfiles.com/ugd/b8c837_c773afb0a1c040b3abcb07471c7f7c08.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc93742ee76546159e689593b292a611.pdf
    • https://static.usrfiles.com/ugd/79cb75_6808cb53f7c648debd1cb9dd24056a4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9d6be1a28a548239a37b2455aadb723.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9269d17b71a4edd87cb2a3594e3f91f.pdf
    • https://static.usrfiles.com/ugd/7f16bd_505faeaff6454b138a5a6f468a284071.pdf
    • https://cdn.shopify.com/s/files/1/0431/9513/8208/files/fevesemalujufizexulelir.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/konobijerobejabezurudibal.pdf
    • https://cdn.shopify.com/s/files/1/0436/9901/1738/files/aristotle_nicomachean_ethics_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/0813/8150/files/blocked_out_mills_eagles.pdf
    • https://cdn.shopify.com/s/files/1/0433/2129/5006/files/increment_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/wodedajosubipipiga.pdf
    • https://cdn.shopify.com/s/files/1/0439/4093/7896/files/saxajuwadezabapasok.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/86360509345.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064eb.bin
eb9381ad2523f2b5db3d099420e0bc9db7eaa75989cf95b264a3e7781b93bbe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EB 4672 bytes
font_01_sfnt_off000074e2.bin
07828aa1d6315f0219dc1d61d58ab0d1cb7873af65bd172c1a0f78b267cd5fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E2 11996 bytes
font_02_sfnt_off00009a35.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A35 4324 bytes

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