Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c1aa80714e8309…

MALICIOUS

PDF

39.5 KB Created: 2020-08-13 18:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb3aa3e8cd5a2be70a89f92e062ede39 SHA-1: e1ee658324764247a2a50e002efa0cd252670ca3 SHA-256: e3c1aa80714e83090f608d3208b7db94d4984e744c849494c5a46d3ff18352a6
130 Risk Score

Malware Insights

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

The PDF file contains a link farm and a malicious redirector link. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for downloading a document. The presence of a visual download button heuristic further supports the social engineering aspect of this attack. The primary malicious IOC is the redirector URL.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=sap%20mm%20functional%20specification%20document%20pdf
    • http://files.rcdavis-tellinstories.com/uploads/1/3/1/3/131383624/ebc2656e5828c5.pdf
    • http://files.wrigglefingers.com/uploads/1/3/1/3/131398066/6871145.pdf
    • http://files.moirajo.com/uploads/1/3/2/7/132710655/6052939.pdf
    • https://cdn.shopify.com/s/files/1/0432/2154/9217/files/kakamolojirugo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6521/2066/files/market_analysis_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/6181/9045/files/jebebikibuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/wufosusisatiburusilix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/niwefevuvopisoxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7341/files/budget_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/how_to_save_finale_as.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/sports_vocabulary_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0448/3943/6449/files/wuwuzogozo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/aloe_vera_nombre_cientifico.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/1678219153.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_off00005ada.bin
1f0f74bd5f0073d8a79bd030def366eaed646b75695e6be2a1eaffab9ef9fbbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADA 5308 bytes
font_01_sfnt_off00006cd1.bin
348fb4110d835a1b7e9b17be3ec2a0a1c3e0abe6edce9a4ce3495ae59b1f3854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD1 10696 bytes

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