Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cfe2330439fd87…

MALICIOUS

PDF

51.6 KB Created: 2020-07-30 09:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fa9926beaa8cc149baf30a4520107a3 SHA-1: 7046a7848b96fde7eec19757b6cf39b5d0206b30 SHA-256: 45cfe2330439fd87a8d58a024254705712ecc30f0061507d9713eaca72bae447
168 Risk Score

Malware Insights

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

The PDF contains a lure for a free PDF to Word converter, coupled with a critical heuristic firing for a malicious redirector link. The document body, though truncated and partially corrupted, contains text related to the converter lure and metadata indicating it was generated by wkhtmltopdf. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine ranking for malicious content. The primary malicious IOC is the redirector URL, which likely leads to further malicious activity.

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/pify?keyword=free+pdf+to+word+converter+editable+text+online
    • http://files.colegioinglesprimaria.com/uploads/1/3/0/8/130814858/9409778.pdf
    • http://files.themeditatingcowboy.com/uploads/1/3/1/4/131452958/nivanez_tawumivunukep_dokoxo_leratenaxolo.pdf
    • http://files.turkanagemasycristales.com/uploads/1/3/0/7/130776344/459e0c.pdf
    • http://files.jmbmoldings.com/uploads/1/3/2/3/132303082/kimojot_vozifof_runazagezezoda.pdf
    • https://cdn.shopify.com/s/files/1/0439/5397/9550/files/togesedovujodixejiko.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/13539850522.pdf
    • https://cdn.shopify.com/s/files/1/0432/6532/7262/files/56903244538.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/82925762223.pdf
    • https://cdn.shopify.com/s/files/1/0433/0265/0014/files/94282471945.pdf
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/sebudizazubo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6423/files/88460744732.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/ziwenopanefasanidagedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/faruleguzokebomepoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/15514352211.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_off00008bf5.bin
e5aa7d66ecfa64ae3df0dc42ab4aeff1eef20c62c8421a776b56b4df48b7753a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF5 5072 bytes
font_01_sfnt_off00009d52.bin
52c7d6e9fa87a6d943d272ff3b68f597252caa5dadb468c06d0573b6afc78d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D52 10392 bytes

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