Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d3e5bb36976f20…

MALICIOUS

PDF

39.6 KB Created: 2020-08-19 23:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d52a68027bfbbee846330747bf3a2c5 SHA-1: 3176c922467bd31dfb0888af1e1ae484ae463371 SHA-256: 87d3e5bb36976f20b7bb52c3e6ec63c1252336aa02a1978e46aa29add3bc5290
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 for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Cisco hackerrank questions and answers' and the primary malicious URL. The file likely aims to redirect users to malicious infrastructure through these embedded links, potentially for phishing or malware delivery.

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.com/pify?keyword=cisco+hackerrank+questions+and+answers
    • http://files.allstarskaraoke.com/uploads/1/3/0/9/130969748/7215338.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/75886185458.pdf
    • https://cdn.shopify.com/s/files/1/0435/9841/3987/files/vavug.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/nelivawazi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8123/files/gemukobutavifowumimaneja.pdf
    • https://cdn.shopify.com/s/files/1/0435/6279/5171/files/kuta_software_infinite_algebra_1_gcf_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0996/6239/files/11239184873.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/12513851824.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_off00005970.bin
fb4b821f3bca740eea16a37560512d0a65fdc14cf93ca9416c6eb793e38e24b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5970 5184 bytes
font_01_sfnt_off00006b0f.bin
7d355cfc893d0d99ac4f3279a2815665fc892cb9918642f06f26a2558c5a7f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0F 11524 bytes

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