Malicious PDF — malware analysis report

Static analysis result for SHA-256 5581a88518a42f01…

MALICIOUS

PDF

41.8 KB Created: 2020-08-20 19:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 555ed4fea0eb359d1cece27ff4f53651 SHA-1: 68f6ee9a570d2087cf4e5abc2640c3bbd0078204 SHA-256: 5581a88518a42f019885cce07cb40a4d6bca97bbc033c3913b5fe163a7357e18
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the text 'Apa appendix format example' and the malicious URL, suggesting a lure to a malicious site. The presence of numerous PDF links, many hosted on cdn.shopify.com, indicates a link farm designed to obscure the primary malicious destination. The embedded JavaScript likely facilitates the redirection or further payload delivery.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=apa+appendix+format+example
    • http://files.sewakwelfaresociety.org/uploads/1/3/0/8/130814774/papiruroboxedir.pdf
    • http://wubodoka.webproxyforfree.com/uploads/1/3/1/8/131871395/nedurime_pinenates_zopukevup.pdf
    • http://dokirid.freebirdbooks.com/uploads/1/3/0/8/130814328/2614673.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/customer_centric_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/9282190383.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1943/files/fuwefijorijabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/96577406276.pdf
    • https://cdn.shopify.com/s/files/1/0428/9124/7779/files/pexofifogakemawa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2230/9786/files/38235365001.pdf
    • https://cdn.shopify.com/s/files/1/0466/7447/7221/files/android_bluetooth_bad_sound.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/vubupi.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/jomupupixurovivajik.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_off00006741.bin
308f7c2a5ef0663c334f4032900f747a68444aa35e2f55189ec9f24721de7b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6741 5068 bytes
font_01_sfnt_off0000786a.bin
320bc99b2f9f27513cda92cd209f445f54b27d7b2e93f663f35270f8bce41727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786A 10060 bytes

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