Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c31f0b46c45c2a…

MALICIOUS

PDF

50.3 KB Created: 2020-08-31 00:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b2af371166ddcc71141378f6ecb3f88 SHA-1: ca93ef71620047d129780a74e2977a952fc19d50 SHA-256: f4c31f0b46c45c2ad60166d5fe4dfea29bfa1308fc454a58d1779e13c93b8bf5
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is embedded within the document body, disguised as a download link. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify. The presence of a 'download button' heuristic further supports the lure mechanism. No scripts were extracted, and the document body is heavily obfuscated, but the primary intent appears to be redirecting the user to a malicious site.

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.ru/wix?keyword=descargar+gratis+libro+english+file+elementary+third+edition
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/cancer_de_boca_ministerio_da_saude.pdf
    • https://cdn.shopify.com/s/files/1/0462/6006/0309/files/xekuzaxinimajawozid.pdf
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/appassionata_secret_garden.pdf
    • https://cdn.shopify.com/s/files/1/0434/4109/4817/files/64762281371.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/91575897628.pdf
    • https://cdn.shopify.com/s/files/1/0428/9249/2963/files/gambar_animasi_kartun_lucu_bergerak.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/84554581427.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/xoribej.pdf
    • https://cdn.shopify.com/s/files/1/0427/8288/4006/files/261348214.pdf
    • https://static.usrfiles.com/ugd/b8c837_41d13a3249a24646b06d8eedd46bd597.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a43290e0ff74657842655e5bd14445d.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/60194698402.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/pozijejon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78683638278.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96258555683.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_off00006c34.bin
1c7d33e7a7f3b8e96bf182bfd33e1b304848773ef866b6d4ee8c3548b5a9ed7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C34 5676 bytes
font_01_sfnt_off00007f53.bin
e545f0ed00527a992730eae16864b25ac63b80c3032a894c7fd0f6bf043bf32f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F53 10152 bytes
font_02_sfnt_off0000a253.bin
662e673a1568c57d68c93355829d7792b0bdc9e06abba3f05e777308544bdf44
pdf-font-stream PDF embedded font (sfnt) at offset 0xA253 17152 bytes