Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1cafcc230f6d2f…

MALICIOUS

PDF

41.4 KB Created: 2020-09-01 09:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 444d208e06cc94304188c7be6349b4a5 SHA-1: ee9889c7064a5fc589a25e813c0bc0a20cd78735 SHA-256: 5a1cafcc230f6d2f50293a9c5d1c054a33df455a919ca3628be6b6b95e80179e
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one heuristic specifically identifying a malicious redirector. The document body, though partially corrupted, contains text related to PDF file size reduction, aligning with the malicious URL's keyword. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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.ru/pify?keyword=pdf+file+size+reduce+150+kb
    • https://static.usrfiles.com/ugd/b8c837_4ba0a978e0bb41e2972748cc6b0578d4.pdf
    • https://static.usrfiles.com/ugd/510a18_4493b4b6f49842a8b957e88cfb86920a.pdf
    • https://static.usrfiles.com/ugd/38bf1f_94de2d3ac7614fb88b0ffb88b36c2c3f.pdf
    • https://static.usrfiles.com/ugd/2ca09c_2b770de6112541e89e251a8e7695bd72.pdf
    • https://static.usrfiles.com/ugd/136d07_3ab84553731245c7b7ec9063b087db40.pdf
    • https://cdn.shopify.com/s/files/1/0435/1324/9944/files/pokibanepudibapilugupuwiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6358/files/femidifivadufagimub.pdf
    • https://cdn.shopify.com/s/files/1/0437/6893/8647/files/lixaroguxogefunojige.pdf
    • https://cdn.shopify.com/s/files/1/0466/5635/6517/files/83188687143.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9957/files/wobojuwajozuzonuji.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/84473210701.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9394/files/arnold_schwarzenegger_s_blueprint_to_cut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54748680829.pdf
    • https://cdn.shopify.com/s/files/1/0452/3651/9069/files/63177911783.pdf
    • https://cdn.shopify.com/s/files/1/0437/4993/3208/files/17049733560.pdf
    • https://cdn.shopify.com/s/files/1/0431/1000/6940/files/lesunejujawekevevevozogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8391/4654/files/33694258672.pdf
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/34409585980.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_off000064b8.bin
94ecab9989d62267556baea5e2f36b0bd1887fa864d22c0e013c674037ae0808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B8 5380 bytes
font_01_sfnt_off00007728.bin
d2eb0a1c2962af7f98b08b515fbc39ae30c8061081cfcdcf40ab0bad5a8800a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7728 9700 bytes

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