Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfa32fdb419a23c…

MALICIOUS

PDF

68.0 KB Created: 2020-08-29 20:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8296a36e0a54c52b01992154ec79ef7a SHA-1: 03ca732ec38eac69ec3c42a9641d0ca6120b8065 SHA-256: 6dfa32fdb419a23caf4bb244a5ca2f595519afa2d17d8bae974f02d696af5c6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link that points to 'ttraff.ru', which is flagged as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into downloading potentially harmful content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/wix?keyword=download+from+tubi+tv
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8875/6384/files/12678324590.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/92434828908.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/70565826443.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kusamusa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2559/6573/files/heavy_fleece_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/7649/2195/files/bolosokul.pdf
    • https://cdn.shopify.com/s/files/1/0430/0757/4179/files/55899867995.pdf
    • https://cdn.shopify.com/s/files/1/0434/7428/8793/files/slader_stewart_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0469/files/setting_up_a_web_server.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a2f1bb028824d18b235d7011b930a57.pdf
    • https://static.usrfiles.com/ugd/173616_e35c125a3f424612af3e5b8fb931409f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4256e1a6ffbf4d08a811cea1e5adb1dc.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_off0000c741.bin
f33c1a68de2bc01f12cad41cb81d2484d4f67818de251c7fc4a0ce9c48f75be7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 5164 bytes
font_01_sfnt_off0000d8ce.bin
0aa1aa234f2df8c1e20d61a0b57b878777bbba84ab0ae1d119180bcbe3eabc91
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 13392 bytes