Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a5a244cd07716a…

MALICIOUS

PDF

45.7 KB Created: 2020-08-21 04:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4417cfc9f7acbf929d27dd8d9d70706 SHA-1: 5511d132d8436c8883f9c79f3b19a4e0b1bf0d59 SHA-256: 50a5a244cd07716a12c9b23e9e5985ffb03875df713f8279bd2804cd3d9bcd8a
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely to appear legitimate. The primary malicious link, https://ttraff.com/pify?keyword=6th+grade+math+worksheets+pdf+free, is a known redirector. This suggests the document is designed to lure users into clicking malicious links under the guise of educational material, leading to further compromise. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=6th+grade+math+worksheets+pdf+free
    • http://files.hordlevoluntarycare.org/uploads/1/3/1/8/131856769/1185162.pdf
    • http://wixino.makinglearningvisibleresources.org/uploads/1/3/2/7/132712354/ad803823.pdf
    • http://fojidupij.benthompsoncreative.com/uploads/1/3/1/1/131164250/9294282.pdf
    • http://files.meridianquinn.com/uploads/1/3/1/3/131380063/1399459.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/jikadijobunuzoluj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/fivawikojejobenofu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2855/9510/files/28544250976.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/tv_paint_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/zonosabifid.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/advantages_of_globalisation_in_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/kuvogofiridobosebififiler.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/mejuwof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagesagebog.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/unir_dos_en_uno_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0436/0693/3661/files/20828652884.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/30644525872.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/jorodaxitulit.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/jezakesunatimafefob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006611.bin
79ccc96b42c711c4a60e9d64761a6aa4ea9a6d1cffb782a35cd64d296dc1af07
pdf-font-stream PDF embedded font (sfnt) at offset 0x6611 5272 bytes
font_01_sfnt_off0000780b.bin
4dff9ea4081a92a060f8931a7b61bdd3bf52f9713c6f8551fc7e47cf2a9dce93
pdf-font-stream PDF embedded font (sfnt) at offset 0x780B 10280 bytes
font_02_sfnt_off00009b4a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B4A 4324 bytes