Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ddc7e1d67e3068…

MALICIOUS

PDF

66.9 KB Created: 2020-07-31 03:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cca756680948bd8f6da20ae3409866a SHA-1: 9576d71686965f87bcedcc8ad8d612d20d7c7a47 SHA-256: 93ddc7e1d67e3068555f04d1f06fca8e2211cb3cf873eeca64ac012bbd1b731d
154 Risk Score

Malware Insights

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

The PDF document uses a lure of 'free download english story books in pdf format' to entice users. It contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=free+download+english+story+books+in+pdf+format'. This indicates the document is designed to redirect users to malicious sites. The presence of numerous external PDF links, many hosted on cdn.shopify.com, further supports the SEO link farm heuristic, suggesting a tactic to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=free+download+english+story+books+in+pdf+format
    • http://files.cameliascandles.org/uploads/1/3/0/9/130969075/nijagobagufuwa.pdf
    • http://files.kelseyviola.com/uploads/1/3/1/0/131070918/kekakaf_kilabunuwafe_pitizut.pdf
    • http://files.thecarluccishow.com/uploads/1/3/1/8/131856257/wezubutapexunab-vuxitegaponed-miwosapofukefoj-dokexekoj.pdf
    • http://files.sgga.info/uploads/1/3/1/0/131069886/4eb08.pdf
    • http://files.womensmarchottawa.ca/uploads/1/3/2/8/132815787/8363005.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/xofowi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1972/files/77021720640.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/14463266318.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/27212983901.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4930/files/turolawova.pdf
    • https://cdn.shopify.com/s/files/1/0432/8128/5286/files/7153701948.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/pimobedaretovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/89129642066.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/fekidexogufi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/81179637729.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5129/files/xababulixabudezokowixo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/47082808670.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.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_off0000bcd5.bin
05beaa3729110b8c0d8ccd8f83341bda79f9a3cdcab72468bb6e02be633deb0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD5 5596 bytes
font_01_sfnt_off0000cfc9.bin
c3a8b4eee93e57c283f6adbdda7d9cf72306d40bc963f7bb8a8eb0d70eedd6b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC9 14948 bytes

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