Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4163cd0f70df217…

MALICIOUS

PDF

53.5 KB Created: 2020-09-01 02:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80578b3ca00b3000749461c222d4e898 SHA-1: ff9eb6b0d689ff2e531c89d2de84e39f584a33ef SHA-256: c4163cd0f70df21770c6067527a848f86100a8d8f7f68b1ba354166df2421135
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=citrix+receiver+cleanup+utility+free'. This, combined with the PDF_SEO_LINK_FARM heuristic indicating a large number of outbound links, suggests a phishing or social engineering attack. The document body text, though heavily obfuscated, contains keywords related to 'Citrix receiver cleanup utility free', reinforcing the lure. No scripts were extracted from this sample.

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=citrix+receiver+cleanup+utility+free
    • https://cdn.shopify.com/s/files/1/0430/1812/5465/files/pathophysiology_of_disease_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8180/files/sibififaxujetoniladiri.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/cuidado_del_medio_ambiente_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/hunger_games_3rd_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2345/files/lorulusifuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17232613021.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/3204455254.pdf
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/non_empirical_research.pdf
    • https://cdn.shopify.com/s/files/1/0432/2046/7869/files/26480684218.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/rumozozejefowefoziju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tinoled.pdf
    • https://cdn.shopify.com/s/files/1/0435/8212/8291/files/pibenulekopaneruvebukelu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9125/files/19093072000.pdf
    • https://cdn.shopify.com/s/files/1/0440/2076/0734/files/34909785687.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/9967247150.pdf
    • https://cdn.shopify.com/s/files/1/0435/9595/6386/files/87445912488.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_off00005ee3.bin
32cbe3f58acf464f50ab1e9d0486f522fdeefc6bcd24f0ab509dea037e0f7a4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE3 16284 bytes
font_01_sfnt_off0000940a.bin
380838ac3bf31ffeccc0e3640777e790ca9876c9844c57fdd9cd844323deac32
pdf-font-stream PDF embedded font (sfnt) at offset 0x940A 4968 bytes
font_02_sfnt_off0000a514.bin
72fa7f6f0c3130c7cca1beeb2e877b57ade3a5f81d3306ddd92c8710d2547754
pdf-font-stream PDF embedded font (sfnt) at offset 0xA514 10484 bytes