Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c83072d3ca508a2…

MALICIOUS

PDF

42.7 KB Created: 2020-08-03 14:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 404070691fea7b19e5ddb711e52beb93 SHA-1: 6ef4a1289cb69b77c4d77ef505e60c4af66f9455 SHA-256: 8c83072d3ca508a2162365114d63c222c4e697696cdb13070dd5edb97cc7e0b7
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=ctet+answer+key+2020+pdf'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs hosted on platforms like Shopify. The presence of a 'download button' lure further supports the malicious intent. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, reinforcing the attack vector.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ctet+answer+key+2020+pdf
    • http://files.snapledger.co/uploads/1/3/2/6/132696128/464258.pdf
    • http://files.thetrustedbankerstore.com/uploads/1/3/0/7/130739344/37ab52ef794094.pdf
    • http://vibij.craftsbytheriver.com/uploads/1/3/0/7/130739625/bivaradepibiku.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/rokalipuxetebipemovobelid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7633/7318/files/99904354537.pdf
    • https://cdn.shopify.com/s/files/1/0439/0469/6472/files/39842057234.pdf
    • https://cdn.shopify.com/s/files/1/0433/9692/3555/files/80021789508.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/vominedawamobewomaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5719/2853/files/pitonisuzixaletanilesoru.pdf
    • https://cdn.shopify.com/s/files/1/0437/4803/2666/files/17006039491.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/23176284978.pdf
    • https://cdn.shopify.com/s/files/1/0431/8507/8423/files/bisodakasaluvexusojaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9747/3699/files/35077189707.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerivavegexem.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/15419553905.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_off0000687e.bin
af01bdeafc262d860bd4291815e0d8f32456a581eeb5a7af7dfab31563dd471d
pdf-font-stream PDF embedded font (sfnt) at offset 0x687E 5440 bytes
font_01_sfnt_off00007b25.bin
fe4f90b242b58dba5b8de50079571957a9650e46fa5ab4095a3fbf852dc71a56
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B25 10380 bytes