Malicious PDF — malware analysis report

Static analysis result for SHA-256 288f152572d7b46d…

MALICIOUS

PDF

34.4 KB Created: 2020-08-03 12:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3e1baf1ca5456bdf3617e56e3795113 SHA-1: 5c149207c374d4f876ba5c45c32fd764cda8c97c SHA-256: 288f152572d7b46df16ed2b2291003d97ab04e162fe458acd47dda9df1f1d04c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on various domains, including a known malicious redirector at ttraff.ru. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=tenor+banjo+chords+pdf
    • http://files.poetweaver.com/uploads/1/3/1/6/131606494/wumumofoxobuna.pdf
    • http://files.makeup-design.net/uploads/1/3/1/6/131637658/4930563.pdf
    • http://files.forestcityfarms.com/uploads/1/3/1/3/131398045/dimibigaxabe.pdf
    • http://files.jesuscatmovie.com/uploads/1/3/1/4/131437702/mazoxirexaligi_melirokido_jivalimus_povogi.pdf
    • http://files.mosaicsbyvictoria.com/uploads/1/3/1/4/131482975/ddfc831080.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/soloxugije.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7894/files/fijakafivalezagotodadudo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0831/7850/files/zexufarud.pdf
    • https://cdn.shopify.com/s/files/1/0433/9177/8965/files/37458707138.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/11101696271.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8999/files/bebefava.pdf
    • https://cdn.shopify.com/s/files/1/0433/4924/6102/files/jquery_get_scroll_position.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004abb.bin
a477038687eb37ea6843477155adba2b12a7013acdb4f0d2dc035f17aba79525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ABB 5376 bytes
font_01_sfnt_off00005cf7.bin
c20ef944c4cde4c5b47d9fe2e92931f593753f4b86374dc653415fce81626a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF7 9432 bytes

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