Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff9368eefa2f763…

MALICIOUS

PDF

42.6 KB Created: 2020-08-25 07:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a441345f79f4e798f1cfb988cf106af6 SHA-1: 81ff09bfa55f2d426dc81d6956692ccd78653605 SHA-256: bff9368eefa2f7636f1434574f0a40509d97e6b46605b33ef55ded2f26f6af17
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.cc/pify?keyword=boom+beach++latest+version', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'boom beach latest version' and the authoring application, further supporting the lure. The ML classifier also flagged this PDF with high confidence.

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.cc/pify?keyword=boom+beach++latest+version
    • http://files.daphnefatterphd.com/uploads/1/3/1/8/131857305/1b1ae.pdf
    • http://zagonif.crosshomesolutions.com/uploads/1/3/0/7/130775929/timajiripenap_kapubetu_kenoton.pdf
    • http://xuled.comprehensivewellnesssolutions.com/uploads/1/3/1/4/131413418/rovivatipazi-botugisuda-pijuput-lipajojudowu.pdf
    • http://files.prettylittlebath.co.uk/uploads/1/3/2/6/132682806/tanerenu.pdf
    • http://nafuk.selflovedetox.com/uploads/1/3/2/8/132814930/farizolizotipubepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/el_materialismo_carlos_fernandez_liria.pdf
    • https://cdn.shopify.com/s/files/1/0434/4732/0728/files/nefuzidizanikumu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2962/files/50204300995.pdf
    • https://cdn.shopify.com/s/files/1/0434/4292/9821/files/toyota_supply_chain_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/1777076264.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/66636708012.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/26621563893.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0590/files/korean_business_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0433/6739/9575/files/2018-_19_school_calendar_template_google.pdf
    • https://cdn.shopify.com/s/files/1/0440/1315/8565/files/cancer_de_pulmon_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/45777553714.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_off0000686f.bin
482e2388cac45e6de20d94e1cd370f99b243a09a1b64a96048f84f79404072d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x686F 5288 bytes
font_01_sfnt_off00007a49.bin
066a8bbf0f76f74a70f2b2a965d4c1b3b4eabebb766226db7d0dd821c19b119a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A49 10196 bytes