Malicious PDF — malware analysis report

Static analysis result for SHA-256 af065875410f46b0…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 12:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b034598e7cd99f267195c158a6bdec2e SHA-1: d2aed3e6828821a228bb17de0b5e2519360c70c8 SHA-256: af065875410f46b0e295aa9e74288fe9a1d810b6b0cc181d98193cc14a3af03a
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large farm of external PDF links. The primary malicious URL identified is https://ttraff.com/wix?keyword=esperanza+matematica+ejercicios+resueltos, which is likely used for SEO spam or phishing. The document body, though heavily obfuscated, contains references to this URL and numerous other benign-looking PDF links hosted on platforms like Shopify and usrfiles.com, suggesting a coordinated effort to distribute malicious content through a link farm.

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.com/wix?keyword=esperanza+matematica+ejercicios+resueltos
    • https://static.usrfiles.com/ugd/173616_6c53bd86661d4bb3a96820af0d5bdc67.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_339d2f7da983464793c7df0ed98fb0fd.pdf
    • https://static.usrfiles.com/ugd/de65f7_c7a0c8153bf041028e6478ad2af0fb52.pdf
    • https://static.usrfiles.com/ugd/97493d_e25da8376ffc430c90649fc49dd85e0f.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/sinemolutoleguweluzat.pdf
    • https://cdn.shopify.com/s/files/1/0432/0103/6443/files/battlestar_galactica_torrents.pdf
    • https://cdn.shopify.com/s/files/1/0450/6897/6291/files/york_air_cooled_chiller_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8203/files/teviberos.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9073/files/xapixesuza.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/xewovowokodirige.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4541/files/sowipopabivejukilemep.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5190/files/80571213209.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_off0000619e.bin
b11167a87a7e03e6b5be8494879096a175e310edb5479cf708afbbaec506ec15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619E 5160 bytes
font_01_sfnt_off00007323.bin
b13f3079bef8fbf818f4b6855e07f433fe033ae52d953ca7d21eb287f80bf9bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7323 12064 bytes

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