Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe038196af7eb53…

MALICIOUS

PDF

43.5 KB Created: 2020-08-12 01:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b753934be6185b7b6de6bb6ef5e5066a SHA-1: 42b933f6c3c4a4b6c32b3a40aedc0b3ce17b81d2 SHA-256: 9fe038196af7eb533ecdc8123f28f034720b40e18fc46d18ca1f445e292bf5d5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a document about auditing standards. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many pointing to Shopify-hosted PDFs, suggests a link farm or SEO poisoning tactic. The primary IOC is the malicious redirector URL, which is likely used to funnel victims to a further stage of the attack.

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.com/pify?keyword=canadian+auditing+standards+pdf
    • http://files.luisnrstudio.com/uploads/1/3/2/7/132710627/12365.pdf
    • http://gukijar.be-sharp.co/uploads/1/3/1/1/131163725/zenuvokud-wenetejur.pdf
    • http://files.triplepottamusg.com/uploads/1/3/0/9/130969435/8605794.pdf
    • http://files.cogitojiujitsu.com/uploads/1/3/2/7/132740253/c02f3.pdf
    • http://files.circlecitydanceproductions.com/uploads/1/3/1/8/131858044/dikilijugo_devazuk_werakurokipolu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9490/7810/files/lakshmi_ashtakam.pdf
    • https://cdn.shopify.com/s/files/1/0436/9429/3142/files/bleomicina_mecanismo_de_accion.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/gexodunuxomutug.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/zarikaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/the_5th_wave_book_2_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2274/4741/files/73517762215.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/kewexuve.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/nefetebu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/44738185880.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/pan_africanism_in_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/darinimojij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/hoover_manuals.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_off00006e22.bin
e76f506c058556319b9836397f6ab2aec3c192e2adf8e03aba5f7531cac79e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E22 5084 bytes
font_01_sfnt_off00007f79.bin
be6467478cf53c6eafc164b0171cbdbaf55490190019ff3ce220829328fa32b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F79 9824 bytes

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