Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96856cdff0fc590…

MALICIOUS

PDF

37.9 KB Created: 2020-08-04 22:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 758ca400067d316f4a4eb2bb52b72a5c SHA-1: 204dbc52e34ae69a9b2c6bd3cfbfc0cd88132f3b SHA-256: e96856cdff0fc590e92858479c224b32bbcf693dbd6296944b1f1558a8ca3899
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains text related to 'conditional clause exercises pdf' and includes the malicious URL, suggesting a lure to trick users into clicking the link. No scripts were extracted from this sample.

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=second+type+conditional+clause+exercises+pdf
    • http://files.oxnardea.org/uploads/1/3/2/7/132740408/5ebd73748b1ac.pdf
    • http://files.bluenosewoodworks.com/uploads/1/3/2/8/132815961/somokirolurujewikusi.pdf
    • http://files.probionic.net/uploads/1/3/0/9/130969874/dageloletifoken.pdf
    • http://fobato.crispusattucksalumnilettermen.com/uploads/1/3/1/4/131453645/33830cd1dafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/40042638691.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/62793234012.pdf
    • https://cdn.shopify.com/s/files/1/0438/9722/5368/files/kasafo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7214/3001/files/33505410572.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/47047128755.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/31964938837.pdf
    • https://cdn.shopify.com/s/files/1/0429/0458/4355/files/46551567056.pdf
    • https://cdn.shopify.com/s/files/1/0428/6388/6495/files/71152768859.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/21058187868.pdf
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/85865174214.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/mikukoxubolafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bovabokuvuxinapuwukiberem.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1185/files/minecraft_server_advertising_discord.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_off0000554a.bin
bd9130039983ea4ce03d081be7939e6d8ca5d7cca3dd2da8843dfd331689d803		 pdf-font-stream PDF embedded font (sfnt) at offset 0x554A 5424 bytes
font_01_sfnt_off000067db.bin
d7b04321734a120bab13da2f69fdb8cd74f0f7fcf4c1cf4bae7ddf0f57b3b5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DB 10276 bytes

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