Malicious PDF — malware analysis report

Static analysis result for SHA-256 234541a0f83d071b…

MALICIOUS

PDF

46.4 KB Created: 2020-08-22 03:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4bc24678514aff2030345d82b4ccde4 SHA-1: f87aae405be656afc65e0607281f6a660301669b SHA-256: 234541a0f83d071b47ac8147a89341b1775179de146652bf3f9476f730ba859a
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=aha+guidelines+for+unstable+angina'. The document body, though heavily obfuscated, also contains this URL and other URLs hosted on cdn.shopify.com, some of which are flagged as benign. The presence of a link farm and urgency lure heuristics further support the malicious intent of directing users to potentially harmful content. No scripts were extracted from this sample.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=aha+guidelines+for+unstable+angina
    • http://files.nyddc.com/uploads/1/3/1/3/131384407/pazobinep_kobisebebuv.pdf
    • https://cdn.shopify.com/s/files/1/0439/1455/9656/files/23528721436.pdf
    • https://cdn.shopify.com/s/files/1/0430/4797/7114/files/autismo_segun_la_oms.pdf
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/wufikemuwuribupekoxaxe.pdf
    • https://cdn.shopify.com/s/files/1/0448/0958/4802/files/paxful_bitcoin_wallet_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/0914/7043/files/strategy_definition.pdf
    • https://cdn.shopify.com/s/files/1/0449/5812/2139/files/zimubufokoseboxazedamava.pdf
    • https://cdn.shopify.com/s/files/1/0437/8882/8829/files/1176942204.pdf
    • https://cdn.shopify.com/s/files/1/0436/0581/9555/files/wobosatep.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/xiresojovarom.pdf
    • https://cdn.shopify.com/s/files/1/0437/5147/3303/files/vobetida.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/pisamurebipatatigozapaji.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/11849776622.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_off00007823.bin
23ab8da945e7b4ef6f2f3d7f5011da2a4f027551fc5bca43e5ada7741dbd061a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7823 5296 bytes
font_01_sfnt_off00008a1a.bin
54ceb7263813313b024745be1490859cb6a95bb64e4b9d386e75f95111cb58ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1A 10060 bytes

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