Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d70d2d9a38da146…

MALICIOUS

PDF

41.0 KB Created: 2020-08-23 23:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d703c6cb0baaeb97545046210181c3ef SHA-1: 9cbcdf6d3694db16563358a1c742680599afb4ef SHA-256: 0d70d2d9a38da14630924acfe1c56d859b17a245227e0dc8ca1d57a61bc4b0d8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a link farm. The presence of a 'download button' heuristic further supports the conclusion that the document is designed to trick users into downloading files. The document body contains text related to software downloads, reinforcing this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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
  • 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=coreldraw+x6++filehippo
    • http://wumiposem.markpaschltd1.com/uploads/1/3/1/0/131070420/17f2680fb7e2962.pdf
    • http://files.enlightenthejourney.com/uploads/1/3/0/9/130969399/bumexojanuv.pdf
    • http://xowafed.dougansmith.com/uploads/1/3/0/7/130739415/genamopoweputepibufo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/risk_management_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4901/7756/files/5938373887.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/85661730214.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/52864878340.pdf
    • https://cdn.shopify.com/s/files/1/0434/1235/7270/files/article_370_and_35a_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/15224373828.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/aa_plus_driving_school.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/4723187798.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/aircrack-_ng_mac_os.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/72923961722.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000622a.bin
f1d654b34e18f52b86ab09622de8d6d5620f772c6b7add6a621216eab1bfe38b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622A 5168 bytes
font_01_sfnt_off000073cf.bin
90fba0fd53d4bb55f1a68316ca6c1c9746829664be3afa6428491029fe755946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CF 10452 bytes

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