Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afe530f1b3879a8…

MALICIOUS

PDF

71.0 KB Created: 2020-09-14 18:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0267c6b897f4a694736a7f9dac09b796 SHA-1: f6f8c5bfdc879a24208f19e8482feb74850e11c8 SHA-256: 4afe530f1b3879a828060dd4cbb92441cf4f90bcb5ab997283dcfb256a19b6ee
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to PDF files with numeric slugs, indicating a link farm for SEO manipulation. One prominent link, disguised as 'drivers ed chapter 15 test b answers', redirects to 'https://ttraff.club/pify?keyword=drivers+ed+chapter+15+test+b+answers', which is flagged as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

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.club/pify?keyword=drivers+ed+chapter+15+test+b+answers
    • http://files.staffdevjnkie.net/uploads/1/3/2/6/132696174/suduwavafegogububefi.pdf
    • http://files.createwithease.com/uploads/1/3/1/6/131636987/c0fbb4.pdf
    • http://zefoli.thaihouse.ca/uploads/1/3/0/9/130969953/tojuxorofone.pdf
    • http://files.jjjohnsonauthor.com/uploads/1/3/1/4/131437268/lotoxaboxubuw.pdf
    • http://files.meltingtundra.com/uploads/1/3/2/6/132681771/libugabagigad.pdf
    • http://files.severnwildlifecarvers.net/uploads/1/3/0/8/130874394/gasanonozosowal.pdf
    • http://files.yurrugarett.com/uploads/1/3/1/4/131437680/tuvufu_kukugadazagopo.pdf
    • http://jipinoruv.jorgehuertaphotography.com/uploads/1/3/1/4/131438556/zogarife.pdf
    • http://lufis.yelenasnovsky.com/uploads/1/3/1/0/131071157/maboda-ginirab-vaparevame-jafojirilag.pdf
    • http://rudure.frostymeadows.com/uploads/1/3/1/4/131408071/323b0b593aa53.pdf
    • https://cdn.shopify.com/s/files/1/0430/8153/1541/files/61846940260.pdf
    • https://cdn.shopify.com/s/files/1/0463/7677/9931/files/fasupulenixezal.pdf
    • https://cdn.shopify.com/s/files/1/0438/1691/1010/files/hamlet_quotes_about_revenge.pdf
    • https://cdn.shopify.com/s/files/1/0463/3486/9661/files/73880632604.pdf
    • https://cdn.shopify.com/s/files/1/0437/5022/8119/files/42097376617.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8526/files/dikavajedonoxizizazomop.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/18988190534.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_off0000d9f6.bin
2acc119ca494ae68c1688e964b69f99650fcc6d06093c47c6ba207baaed26d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 5596 bytes
font_01_sfnt_off0000ed15.bin
ce693eab4599f22c4f436df1bbb162df1cfbf6ce8b9c16d17ac9dacb2bbaaddb
pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 9856 bytes