Malicious PDF — malware analysis report

Static analysis result for SHA-256 5819a7d5526aec5a…

MALICIOUS

PDF

43.8 KB Created: 2020-08-23 03:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b96216eb096ef830b49115edf199688 SHA-1: e5120bf343c2c7f421352948a3402b9aa9f6aba4 SHA-256: 5819a7d5526aec5ab3b9d7823125a38e1e53947aac314946ecb590499370ce46
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to attract search engine traffic, with one prominent link pointing to a redirector URL. The document body, though heavily obfuscated, contains text that appears to be a lure for 'hungry shark apk apkpure'. The heuristic firings indicate the PDF is a malicious redirector and part of a link farm, suggesting a phishing or malware distribution attempt.

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=hungry+shark+apk++apkpure
    • http://files.salsmantour.org/uploads/1/3/1/4/131410952/matefiwi.pdf
    • http://files.twc408.com/uploads/1/3/0/7/130775969/76ccfc1f20.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/silamule.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2574/files/22784390552.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9528/files/southwest_airlines_route_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/kovajuji.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/18938264677.pdf
    • https://cdn.shopify.com/s/files/1/0433/5347/3189/files/75064985415.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/676398953.pdf
    • https://cdn.shopify.com/s/files/1/0433/4243/0362/files/cancioneros_de_folklore_para_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/jufelekirologepakuwuk.pdf
    • https://cdn.shopify.com/s/files/1/0444/2878/7878/files/brooklyn_nine_nine_season_6_complete.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_off00006cfe.bin
817b87494c64d7ea447a022e0bc6a90a6bdea26c1f3be49a5c846f8d28d5e79f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFE 5176 bytes
font_01_sfnt_off00007e93.bin
e28e4489f300cf3aaefdf7ac2a42049379504467ac542ad7c7e9baa28661d1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E93 10504 bytes

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