Malicious PDF — malware analysis report

Static analysis result for SHA-256 b497beea8b5ad878…

MALICIOUS

PDF

45.4 KB Created: 2020-07-22 12:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd96b5b9b9a6a8559d939bbbf6163b31 SHA-1: 322b909212317e351c5f9286e48a855b269b5ec3 SHA-256: b497beea8b5ad87883e4148cb25673569f44276b291f8e90911d6b3a95f1f91e
128 Risk Score

Malware Insights

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

The PDF file contains multiple links, including one pointing to a known malicious redirector. The presence of a 'download button' heuristic and the embedded URL suggest a social engineering lure. The document body, though heavily obfuscated, contains text related to counting worksheets, likely a pretext to encourage clicks on the malicious links.

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=counting%20numbers%20for%20kids.%201%20to%20100%20worksheet
    • http://files.columbiapresbyterianchurch.com/uploads/1/3/0/9/130968961/1614375.pdf
    • http://files.antigonekoutalieri.com/uploads/1/3/1/4/131408572/gonijugagoba.pdf
    • http://files.creationjustice.org/uploads/1/3/2/3/132302833/2714242e.pdf
    • http://files.wefightforfood.com/uploads/1/3/0/7/130740257/jizase.pdf
    • http://files.soulbloom.org/uploads/1/3/1/3/131379402/8638775.pdf
    • http://files.creationjustice.org/uploa
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/76366806475.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/51198548577.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/78650841932.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/xuxozogiju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9826/0124/files/mamineposib.pdf
    • https://gubudifoxino.files.wordpress.com/2020/07/jinapeloxevimerosipefu.pdf
    • https://serifutaje.files.wordpress.com/2020/06/66089915439.pdf
    • https://nojilibap.files.wordpress.com/2020/06/jotiwuraruvim.pdf
    • https://cdn.shopify.com/s/files/1/0438/1864/7709/files/fiporekozos.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3363/files/dikazofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/38363985785.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/jojobowupuletoje.pdf
    • https://cdn.shopify.com/s/files/1/0432/6483/5737/files/libiziwitewobujagum.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/69229232498.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/dokuriserod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9620/files/tazagorafir.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_off0000735b.bin
6992211a505b4b87345325c0199b4d83f0b719ae34aafaa144f1940c08cde24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735B 5508 bytes
font_01_sfnt_off0000860e.bin
656c1cd2e4de3adf6717bc7cd96d7cfb735c3105d12be49875772390c2315190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860E 9892 bytes

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