Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa5dc851de9f685…

MALICIOUS

PDF

44.6 KB Created: 2020-09-01 02:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d5abdde33f862599b50ff768af5cb3 SHA-1: ce19e2d638e5c2f1b5cbf93b7117f01816766cdd SHA-256: baa5dc851de9f685a9db0cdecfab31456a548702d0ae33edce028709aecce299
128 Risk Score

Malware Insights

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

The PDF file contains a heuristic match for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of outbound links, many of which are to benign-looking PDFs hosted on static.usrfiles.com, likely to obscure the malicious redirector. The presence of a 'download button' lure further supports a social engineering attack. The primary malicious IOC is the redirector URL.

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/wix?keyword=marathi+to+english+barakhadi+chart+full+pdf
    • https://static.usrfiles.com/ugd/b8c837_68a5d3c55f344a95a4998d1bb1290c7a.pdf
    • https://static.usrfiles.com/ugd/b3bc21_9125cd3c968149f387390f6d5726dcec.pdf
    • https://static.usrfiles.com/ugd/f65518_38b75cbcc9014dddbc44667af5c0767d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0003321d600c4ca7967a273a0d5821d6.pdf
    • https://static.usrfiles.com/ugd/daca0d_30c993d95ad648d88f152ec2c4f272d2.pdf
    • https://static.usrfiles.com/ugd/e3834b_715ef1171c2145999f54f7b4beba0224.pdf
    • https://static.usrfiles.com/ugd/fe83c3_97b4713c3311457e81b15de90c10f35a.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9442/files/65373459869.pdf
    • https://cdn.shopify.com/s/files/1/0464/3058/4984/files/hematology_exam_questions.pdf
    • https://static.usrfiles.com/ugd/dba42a_d94b04e8e0ee42fd904c76bdbcdf0d36.pdf
    • https://static.usrfiles.com/ugd/b8c837_f872e80152084739b4d1b42d023644cb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d9.bin
1088f74d5b5dd529f8d539cf14c95dbb9cc269003fcab083e91f5de7d50cf0db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D9 5628 bytes
font_01_sfnt_off00007501.bin
9f1d5abab8784b6c34908ffad76d43225e176184c2756a6bbd08ce1b62fb67e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7501 10168 bytes
font_02_sfnt_off00009817.bin
0f943c57085486be2c5e6b926cfcaf8a6ba6f758fc47a33655eaaa5b42222fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9817 3264 bytes

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