Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc7854abe5c0122…

MALICIOUS

PDF

59.6 KB Created: 2020-09-01 00:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aecc4096bec45b09abd85d8ccb5cedc3 SHA-1: e5f43f65b7f9ae3a057bf024c6d7b1603cd40578 SHA-256: dcc7854abe5c01221c967fe7ff3a622ee611042d6538a62466e5a99368d01d8c
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to a URL designed to lure users with a search query. The document body, though heavily obfuscated, contains the same URL. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to improve the ranking of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=infectious+disease+movie+contagion+worksheet+answers
    • https://static.usrfiles.com/ugd/b8c837_3747a899bcf04340a272ee1d411db89a.pdf
    • https://static.usrfiles.com/ugd/b8c837_8800f48600f345069d2bbca9e13aedf9.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_946d2edb74424c9193bb6d92088eb2f1.pdf
    • https://static.usrfiles.com/ugd/ad2ade_340e7f94f3f54a718b69b790c7da32d1.pdf
    • https://static.usrfiles.com/ugd/f14cf6_4acc8ecc301d435c99b6361565fea9d2.pdf
    • https://cdn.shopify.com/s/files/1/0436/9013/1609/files/ccass_operational_procedures.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/86458793052.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6685/files/vizun.pdf
    • https://cdn.shopify.com/s/files/1/0437/4023/3880/files/estudio_exploratorio_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/76060100600.pdf
    • https://cdn.shopify.com/s/files/1/0429/6212/4959/files/29943936675.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/cognos_11_architecture_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7626/3841/files/linaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/gowukukazijib.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/topunara.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/wurufoxabiwemufivov.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_off0000a9ce.bin
e137b7291b4fb6e7885235037e44959bb67399787116edf8be04222b39acecd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9CE 5556 bytes
font_01_sfnt_off0000bca5.bin
a3a8be4749586d06bbfb26634db926fc3547932087e0e66c9c8b8586ab47d37e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 10636 bytes

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