Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aa5815d90e4beb…

MALICIOUS

PDF

50.7 KB Created: 2020-08-31 13:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a490b1f77fc4dc51075e870d949f13a SHA-1: 25c186173aa6caaf065e3ed0bf38ea93290a00db SHA-256: 23aa5815d90e4beb2edecb193656786f022608f59b0c58ded7c07ade02f07753
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/wix?keyword=free+rent+lease+agreement+forms`. This URL is presented within the document body, disguised as a free rent lease agreement form, indicating a social engineering lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to benign content on Shopify. The primary malicious IOC is the redirector URL, which is likely used to lead the user to a malicious site or download further malware.

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.ru/wix?keyword=free+rent+lease+agreement+forms
    • https://static.usrfiles.com/ugd/4117a9_d78f894f78fb4c88af7a8b76a4d594cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_17394378c2454fe4af15017234932237.pdf
    • https://static.usrfiles.com/ugd/3e9e83_cb70dd4382bd46d3b62443127c315557.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/final_fantasy_12_action_replay_max_codes_all_weapons.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/tojet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1520/files/97301889221.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1496/files/27292951468.pdf
    • https://cdn.shopify.com/s/files/1/0432/4078/4035/files/82419882919.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/diferencia_entre_ansiedad_y_estres.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5224/files/nusabapafemoxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/85545101714.pdf
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/pedagogy_of_history_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d45.bin
11a6b3fb259ba08c04e193d57433d2dd3e52ff6594f7f7dba0ee48d908176459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D45 4784 bytes
font_01_sfnt_off00008d69.bin
55d4f7dc2ba1d068310e9dead738dcdb8cd9bfa6d539371890a6db601d90da05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D69 10080 bytes
font_02_sfnt_off0000afec.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEC 4324 bytes

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