Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25ed9a0aee034e9…

MALICIOUS

PDF

50.3 KB Created: 2020-08-07 04:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0164af8400723e11db1c30bbd2a04a2 SHA-1: 508ed1a4220849a368acdfef0255f65874f4572b SHA-256: a25ed9a0aee034e9519ce855ac13a9517ee43f383304abe4c038fa609c7eddd9
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary link, 'https://ttraff.cc/pify?keyword=bncc+lingua+portuguesa+ensino+medio+pdf', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious infrastructure. The presence of numerous links, including those hosted on Shopify, indicates a link farm strategy to obscure the final malicious destination.

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=bncc+lingua+portuguesa+ensino+medio+pdf
    • http://kewiwip.am-tecsecurity.com/uploads/1/3/1/1/131163635/2233324.pdf
    • http://files.artscienceexhibits.com/uploads/1/3/0/7/130739628/gifekedu.pdf
    • http://migajik.jason-molloy.com/uploads/1/3/0/7/130775432/xedusubefasiwa.pdf
    • http://files.mobilemechanicmemphistx.com/uploads/1/3/2/7/132710690/poxoxeso_ragepewifeniz_jumokobapumopag_penep.pdf
    • http://files.bellacalore.com/uploads/1/3/0/9/130969403/loduxajevixagonadaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/p90x_measurement_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/35362374114.pdf
    • https://cdn.shopify.com/s/files/1/0435/3451/6376/files/54215574593.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5175/files/94578428671.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pobilimej.pdf
    • https://cdn.shopify.com/s/files/1/0436/1984/4258/files/59174662282.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/22925424518.pdf
    • https://cdn.shopify.com/s/files/1/0439/5725/6350/files/wodipugumevizodoma.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2037/files/78148305743.pdf
    • https://cdn.shopify.com/s/files/1/0438/0803/0882/files/gamecube_emulator_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0438/9512/8216/files/6121558857.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53522836856.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_off00008566.bin
f5e183fc5ecfcb6122eace03bf9b1475f2f72a3090e1bcd59ef3bd392626027f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8566 5524 bytes
font_01_sfnt_off0000981f.bin
db6087b1b84097be0f7d39e2f8d531cc770064a296e52f3388a763bf1483d82f
pdf-font-stream PDF embedded font (sfnt) at offset 0x981F 10400 bytes