Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8df016e34658fa7…

MALICIOUS

PDF

33.2 KB Created: 2020-08-30 23:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff4a7da7f7268ca0aab0f3f5f851ecb9 SHA-1: b0b510ce2ffbebfc2325f73bceec69b8cfc123a2 SHA-256: f8df016e34658fa75d4d2650246a260f681236db8f562446032511bc1f16a06f
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to academic resources and includes the suspicious URL. The presence of a large number of external PDF links, many pointing to Shopify, suggests a link farm designed to improve search engine ranking for malicious content, further supporting the redirector lure.

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=computer+organization+and+design+5th+edition+solutions+slader
    • https://cdn.shopify.com/s/files/1/0436/1771/4338/files/beethoven_fur_elise_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/cambodia_daily_news_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1146/files/xomapexavefagoperuzuvij.pdf
    • https://static.usrfiles.com/ugd/d162e3_498b2d5b6935419286ee21ffa63c6e83.pdf
    • https://static.usrfiles.com/ugd/36f25b_64459dad74df40968fb137f67bc8f723.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9014f6f1a234e708e17ecb817c429d1.pdf
    • https://static.usrfiles.com/ugd/70a38d_fc24119418524ad2bddf4e44134bbf36.pdf
    • https://static.usrfiles.com/ugd/b8c837_33d8c61b388f47fc97ebbf1c00f5c01f.pdf
    • https://cdn.shopify.com/s/files/1/0438/9086/8379/files/luxuledunuxamidokadinupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/1226691613.pdf
    • https://cdn.shopify.com/s/files/1/0432/9409/7576/files/xml_format_in_notepad.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9575/files/36496796077.pdf
    • https://cdn.shopify.com/s/files/1/0452/5922/7296/files/sitagliptin_metformin_medscape.pdf
    • https://cdn.shopify.com/s/files/1/0432/4032/5282/files/60477668120.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/sefuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1407/files/53923049505.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_off0000454b.bin
b71f84f2200dab0d1e6bfa42a46807f1d4bcc27a84d09bf7c445677b84b4f81a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x454B 5452 bytes
font_01_sfnt_off000057ac.bin
1c2987986d345472ec76c4e9ba94c1c54dcff8a96be941fe4187514db30a2961		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57AC 9208 bytes

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