Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d8ddbdfbab4a7c…

MALICIOUS

PDF

39.8 KB Created: 2020-08-01 10:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6699b5c2ce6f597267486252e9a6612a SHA-1: 3c15110c017429ee0f3bf7f2b21cdef9cde9aa33 SHA-256: 54d8ddbdfbab4a7c01a921237db4ddf256b3e832e71aeb042336cd52dd7bec2e
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lure users to malicious content. The document body itself is largely obfuscated but contains references to the redirector URL and benign-looking Shopify URLs, likely used to mask the malicious intent.

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.cc/pify?keyword=1nf%252C+2nf%252C+and+3nf+are
    • http://files.twolittleducksdesignstudio.com/uploads/1/3/1/6/131606638/0624a4c8169.pdf
    • http://files.dhendricksonphotography.com/uploads/1/3/0/7/130739368/nuwowulijudeti.pdf
    • http://files.functionloops.com/uploads/1/3/0/7/130740255/zuvupak.pdf
    • http://files.allhandscreate.com/uploads/1/3/1/3/131398268/sikofesivusowebanedi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2682/files/13239505242.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/stardew_valley_spawn_items.pdf
    • https://cdn.shopify.com/s/files/1/0440/6280/2070/files/4704061189.pdf
    • https://cdn.shopify.com/s/files/1/0432/5572/6238/files/19730658642.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/tigapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/taguzavinipu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5615/1190/files/osrs_f2p_range_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/19114058830.pdf
    • https://cdn.shopify.com/s/files/1/0432/9065/6924/files/See_https_devcenter._heroku._com_articles_buildpacks.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9765/files/xisixagunetununapabok.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0919/files/vetene.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/83459596064.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/vetibexuw.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_off00005e82.bin
e51234e4cf47d0afe5af91288bbef8ea1420a81941a3cb955813e4f1ee71b1d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E82 5000 bytes
font_01_sfnt_off00006fa3.bin
db1cf3fb3b6eb9f083b7030424ace9df13f59d4be96763e54b58ba9c288b358c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA3 10260 bytes

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