Malicious PDF — malware analysis report

Static analysis result for SHA-256 d646a3e377b3e4b3…

MALICIOUS

PDF

43.7 KB Created: 2020-08-04 00:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0a47a342808c8f824adbeef5a9f4e50 SHA-1: 268654b0bd710a1c2c89059a4e744572d49eff16 SHA-256: d646a3e377b3e4b3fc05f505f984e8dda02f8eb0dde3d98ea42a89b59c5058a3
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for exam preparation materials. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on cdn.shopify.com. The primary malicious IOC is the ttraff.com redirector, which likely serves as a gateway to further malicious content.

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=quantitative+aptitude+questions+with+answers+for+bank+clerk+exams+pdf
    • http://files.edhgs.com/uploads/1/3/1/4/131408529/lujaremokike_nezuki_derunelizaxeti_kelabij.pdf
    • http://files.crescentmortgagecompany.com/uploads/1/3/0/7/130739204/sesafutajajalivewok.pdf
    • http://files.rosenortfellowship.ca/uploads/1/3/0/7/130740292/1424173.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/43899648186.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/gitignore_for_unity.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/bamugifimijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/19354706581.pdf
    • https://cdn.shopify.com/s/files/1/0429/1336/6182/files/65319828909.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/buzemu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/refefabi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0061/7381/files/43893312676.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0430/7009/5521/files/vaxatiwojupuwose.pdf
    • https://cdn.shopify.com/s/files/1/0438/0000/2717/files/kukew.pdf
    • https://cdn.shopify.com/s/files/1/0436/4215/9257/files/71078658752.pdf
    • https://cdn.shopify.com/s/files/1/0434/2638/1975/files/vusifoxowozefoxegir.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_off0000694f.bin
bafc27d27e8b7c8be6484ce57d738d383ea1c9d240d72bf1e737e3335408df7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x694F 6008 bytes
font_01_sfnt_off00007daf.bin
9f84ec65fa7f52f2849e1ecd1d1d6997946ff08750e8e2a32b195f0d0bec1285
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAF 10532 bytes