Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62e971656d73084…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 04:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84fdb2d194c18bf7a5134dfb95267836 SHA-1: fe783c330caede8f47d3bfc1bcab39606d7d34de SHA-256: f62e971656d730847dafe8a25bbf9d3b9f6498787ab25b4fa8a015f7be675a76
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to a known malicious redirector. The document body text, though heavily obfuscated, contains the string "O2 voicemail app android" and a URL pointing to the malicious redirector. This suggests a phishing attempt to trick users into visiting the malicious site, likely to download further malware or phish for credentials. The presence of a large number of external PDF links, many hosted on Shopify, further supports a link farm or redirection strategy.

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=o2+voicemail+app+android
    • http://files.encorewomenschoir.com/uploads/1/3/1/3/131381237/kixaves.pdf
    • http://files.cfcedinburgh.com/uploads/1/3/0/7/130776246/4786388.pdf
    • http://files.sudensuukon.com/uploads/1/3/1/3/131381046/1731382.pdf
    • http://files.sweetbydesigncakes.com/uploads/1/3/0/8/130874683/xejudukoxonaxa.pdf
    • http://folame.millerptorlando.com/uploads/1/3/0/7/130776485/katatov.pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/pdf_file_download_example.pdf
    • https://cdn.shopify.com/s/files/1/0439/4899/8811/files/pugepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1656/0550/files/fijunebadize.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/how_to_know_wifi_password_of_others.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/diwal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80835258875.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/32405959139.pdf
    • https://cdn.shopify.com/s/files/1/0450/5023/2984/files/arnold_schoenberg_theory_of_harmony.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/95152864809.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/87307017412.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_off0000659e.bin
acee248759c5b0849a655b44b19755ffedebfe11769acd5661abb1514a1d240d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659E 5260 bytes
font_01_sfnt_off00007766.bin
45863f6c84b6b821e6da40cbc387687de6d7a3ce57de4254efc6c40cb28f465e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7766 10300 bytes

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