Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf4c47fa32633b9…

MALICIOUS

PDF

42.9 KB Created: 2020-08-12 23:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7d23f9f6dc157f4d2a9282d1cb40560 SHA-1: 9ce26a3fa8318133ce39bab8208f8779ee09c054 SHA-256: dcf4c47fa32633b98febd88b65432f865f68e7fd2e4240b67c9e47a2dd6830bc
128 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, which is also present in the document body. The document also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on Shopify. A low-signal heuristic for a download button lure further supports the malicious intent. The primary malicious IOC is the redirector URL, which likely leads 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.cc/wb?keyword=free%20printable%20worksheets%20short%20vowels
    • http://files.hippo2020.com/uploads/1/3/2/6/132681579/0731f2803b1e3.pdf
    • http://files.prayerknight.com/uploads/1/3/0/7/130776327/bikizogekujiluvajif.pdf
    • http://files.valleybookstore.com/uploads/1/3/1/4/131482915/liwawebe_tirotafilekedap.pdf
    • http://files.littledarlingscookieco.com/uploads/1/3/2/7/132740595/fafixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/fodanizenuru.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/avancemos_2_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/conquering_carpal_tunnel_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/easy_snacks_recipes_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5494/files/gafotikowik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/83758421449.pdf
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/funawowapozadexis.pdf
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/2101277930.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9880/files/lofozani.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/47025307949.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_off00006ac0.bin
36fb3bffdb131e15fb3caaf8a46688507ce18d327317e1c902aa7c88dd34b8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC0 5220 bytes
font_01_sfnt_off00007c88.bin
df2e004cfb09843ddc4b5df328d8d29748e4df083ea7e621e09d5e76bfd9ec92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C88 10128 bytes

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