Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7c5d930944e747…

MALICIOUS

PDF

44.4 KB Created: 2020-07-15 18:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03ef28dc9b99ca6df510ca35cd378698 SHA-1: 6c69ab5ad78a493a947dcc77ef562b8829529af9 SHA-256: 9f7c5d930944e747af0d82f0f01c5878a8d979f18f6c221cc1258332e09ba275
150 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, directing users to 'ttraff.ru'. Additionally, it exhibits a PDF link farm pattern, embedding numerous external links, with the primary one being a potential lure. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

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.ru/wb?keyword=to%20be%20verb%20past%20tense%20worksheet
    • http://files.faithgp.com/uploads/1/3/0/9/130969061/vixax.pdf
    • http://files.businessmanagementorganizer.com/uploads/1/3/0/9/130969077/765f62582471.pdf
    • http://files.greatplainsbeagles.com/uploads/1/3/0/8/130814868/5855319.pdf
    • https://cdn.shopify.com/s/files/1/0430/7009/5521/files/kawetu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/5902059437.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31995481059.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.pdf
    • https://cdn.shopify.com/s/files/1/0434/4827/1000/files/84419498341.pdf
    • https://dijilavuxiji.files.wordpress.com/2020/06/59808054058.pdf
    • https://napipivo.files.wordpress.com/2020/06/83818228878.pdf
    • https://dajovofad.files.wordpress.com/2020/06/83519874708.pdf
    • https://jarojadum.files.wordpress.com/2020/06/87625604165.pdf
    • https://nafevulaxa.files.wordpress.com/2020/07/wumite.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20785775646.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/44111231728.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/19954011924.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/kuvesuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/ninomeziwikodedatud.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/89509635092.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/41907306845.pdf
    • https://cdn.shopify.com/s/files/1/0429/6212/4959/files/goxelutanijize.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/
    • https://cdn.shopify.com/s/files/1/0434

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f24.bin
42f4c8467f38fee531e016eb362220f37f9817886fd72062e4e6fb1e0cd20c5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F24 4920 bytes
font_01_sfnt_off00007fd6.bin
3c04b6eed27bfe674035c3f9fc2a10843bc139cf442bccda6b9212105206e026
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD6 10644 bytes