Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d3c7375327324b…

MALICIOUS

PDF

43.8 KB Created: 2020-08-10 13:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9804ca3c95f01ec229cd258d0c193b6e SHA-1: b25431a8d4751552dddf90bc8f2ad129c283beb2 SHA-256: a3d3c7375327324b0f1c510241170c847c53b3d37587352d5c45a972f1ce9968
150 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is likely part of this redirection chain, aiming to lure users to a malicious site under the guise of learning Italian.

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/pify?keyword=apprendre+l+italien+facilement+pdf
    • http://files.lesleybirchartist.com/uploads/1/3/2/8/132815181/keduxadugejozij.pdf
    • http://fatuzi.ivoryleaguepublishing.com/uploads/1/3/1/8/131856917/98360f5b20f8da.pdf
    • http://bofoweso.xcellroofingqld.com/uploads/1/3/1/1/131164250/9697722.pdf
    • https://cdn.shopify.com/s/files/1/0433/9541/6213/files/nevopubupefenone.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/green_smoothies_for_life.pdf
    • https://cdn.shopify.com/s/files/1/0438/2746/2301/files/recessive_epistasis_ratio.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/75093908456.pdf
    • https://cdn.shopify.com/s/files/1/0431/1043/2929/files/zar_jh_biostatistical_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/waduxefifiposubuwokafuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5952/8355/files/gisofo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/jaxakodixapufufiviba.pdf
    • https://cdn.shopify.com/s/files/1/0432/0467/3697/files/zeloso.pdf
    • https://cdn.shopify.com/s/files/1/0433/3584/3994/files/loguxef.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4677/files/ketejojotekixuwule.pdf
    • https://cdn.shopify.com/s/files/1/0441/2011/3304/files/workplace_health_and_safety.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_off00005f52.bin
08ffbfc8b2d4d421706ad81444f254aa835582db34a6ad3be9a9a9cc4d91a465
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F52 4788 bytes
font_01_sfnt_off00006f73.bin
744ffcae012ea1733ad2fa4b258063b73d5194ce61015f283c6630411ff6f3b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F73 11172 bytes
font_02_sfnt_off000092b2.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x92B2 4324 bytes