Malicious PDF — malware analysis report

Static analysis result for SHA-256 372a949a98ad8277…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 21:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b27c17333a5a729d0cdaaa6d40007842 SHA-1: fbd19d2841fd2633eb20ad8e87a2b60e5106bc1f SHA-256: 372a949a98ad82771bd98df4fc41d19cd9fff11a7a86b082fcb27df041b130fd
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=anacardium+excelsum+pdf', which is likely used for redirection. The document body contains garbled text and embedded URLs, further supporting the malicious intent.

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=anacardium+excelsum+pdf
    • http://legowo.thelearningkirb.com/uploads/1/3/1/0/131069839/zuwad.pdf
    • http://files.amandagretschot.com/uploads/1/3/0/7/130740465/255637.pdf
    • http://kobidad.svejnar.com/uploads/1/3/2/8/132814930/ximubekifuma-wurolopalepos-poguva-bobojuj.pdf
    • http://xosifatuk.mrsamartinez.com/uploads/1/3/0/8/130814328/lipuwezonoxuta.pdf
    • https://cdn.shopify.com/s/files/1/0435/0777/7700/files/jenumefepebezej.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/epub_to_calibre.pdf
    • https://cdn.shopify.com/s/files/1/0437/1133/2507/files/49925877139.pdf
    • https://cdn.shopify.com/s/files/1/0437/0232/1307/files/athletics_jumping_events.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/tamodewevaroxafofukidatu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7529/6677/files/84158177525.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8599/files/lakesesetudiwakul.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/3923083503.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8357/files/dojokeseretakadisisuregej.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/vuleju.pdf
    • https://cdn.shopify.com/s/files/1/0441/0540/0472/files/hernia_de_disco_livro.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/belajar_gitar_otodidak.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_off000068dd.bin
f8e4e880ba21aeca3575bbab200d867854d08609a53137a8bac3e211381f4cb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x68DD 5360 bytes
font_01_sfnt_off00007af8.bin
99446743e0217f6a8482b0517fe70026a9b2e246b1766da409ade9be588199ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF8 9908 bytes