Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f30b731d3fe0b3…

MALICIOUS

PDF

44.5 KB Created: 2020-08-26 07:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b07fad3feeb72b004bbee4236ebe479 SHA-1: 7066afc73073629bc1434edf467084c80ad31d5c SHA-256: 81f30b731d3fe0b3fcb7a69c09faffe572edd35798342ce4825b1f238f3aae86
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, including a critical finding of a redirector link to known malicious infrastructure. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting it is the primary lure. The file also contains a link farm heuristic, indicating a large number of external links, many pointing to Shopify-hosted PDFs.

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=b%25C3%25ADblia+septuaginta+online+em+portugu
    • http://files.kingspointpottery.com/uploads/1/3/0/9/130969131/kajorerodedimar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65028435792.pdf
    • https://cdn.shopify.com/s/files/1/0439/8376/5662/files/dicas_para_alimentao_saudavel.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6024/files/72852554369.pdf
    • https://cdn.shopify.com/s/files/1/0430/5420/3031/files/free_recording_studio_business_plan_sample.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/79238289296.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93236297381.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/vojogibiwegabawuzipet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/pulaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/1864221863.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/16510586592.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_off00006c0a.bin
587ec58f35b997ff4a414beec23a46020462c08bca5bf0835205bca1e2daf4fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0A 5380 bytes
font_01_sfnt_off00007e3b.bin
6c8750ed418d8bd6b019b906fbad1649e9c7d686d5a7dec9a8f4294bec6e0825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3B 12344 bytes

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