Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5194cc35c0670b…

MALICIOUS

PDF

46.0 KB Created: 2020-08-29 10:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e48fdf4edc8b04a97f0b2723b1e9f26d SHA-1: 0118a3479d04783ad760669a46442c1696112da7 SHA-256: 3d5194cc35c0670b406c597c61dd12a6fea5edeb9044f1b2cb114bde56eb2570
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body text, though heavily obfuscated, includes the phrase 'ultra hd tv review' and the malicious URL, suggesting a lure to a scam or phishing page. The ML classifier strongly indicates maliciousness, and the PDF structure with numerous links is consistent with SEO poisoning or link farm tactics.

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.cc/wix?keyword=ultra+hd+tv+review
    • https://cdn.shopify.com/s/files/1/0434/0783/5303/files/daxuvunusax.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/keboseworidafime.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/60989765507.pdf
    • https://cdn.shopify.com/s/files/1/0435/5601/2191/files/java_spring_resttemplate_put_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6961/files/capitalizing_words_in_a_sentence_capitalization_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8226/0384/files/star_wars_audio_books_free_download_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0430/7261/8657/files/2008_honda_element_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/52799519551.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/tafojimod.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/50490264604.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdfd312934db4f7abe1f82318d54d2ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_6844e141f53147ce950f57f484653668.pdf
    • https://static.usrfiles.com/ugd/b8c837_12648dbf70914405acc7e1efd1e0c3a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_dca248b2fdd34075aa563d43fe792528.pdf
    • https://static.usrfiles.com/ugd/b8c837_21a128bb8abd428692a50df8c46191c4.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_off0000623a.bin
da6e17a6f5b01a9e7ea552fa65ecc878023ec2911c0735d9974438e22ab2b98f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623A 4876 bytes
font_01_sfnt_off000072da.bin
8e49c28c9c3f8c0839ceeb80a8e29edc5ef01b66c0aa8a8e24b6a60d9b7da087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DA 10204 bytes
font_02_sfnt_off000095f5.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F5 16164 bytes

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