Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aad6454cfca0fdf…

MALICIOUS

PDF

44.6 KB Created: 2020-08-21 12:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7566b5a3fe05883fd9bb3e85d69d8e7 SHA-1: 0374caeb5d3eda73c38aa8b9a21d01ecb4fcddc7 SHA-256: 3aad6454cfca0fdf0b80a919275129ed8b8d3288278f76b0a94b09cf0cb10f56
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.cc/pify?keyword=school+brochure+flyer+psd+templates+free+s as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to this malicious site under the guise of providing design templates.

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/pify?keyword=school+brochure+flyer+psd+templates+free+s
    • http://jibolomaz.waggonerguidebooks.com/uploads/1/3/0/7/130776023/febf4.pdf
    • http://files.lynnereeder.com/uploads/1/3/0/8/130873930/sotig-nokuziwa.pdf
    • http://files.vtrustjournal.com/uploads/1/3/0/7/130775760/5738340.pdf
    • http://tomigok.norwicharcheryclub.com/uploads/1/3/0/8/130874276/siwufabamaj_noremogawasut_maziv.pdf
    • http://nimajoli.adamhughesphotography.com/uploads/1/3/0/7/130739726/wivemisavidunuwujule.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2276/files/rivezepugoxogi.pdf
    • https://cdn.shopify.com/s/files/1/0460/6820/3675/files/mevupekolinurapizavit.pdf
    • https://cdn.shopify.com/s/files/1/0440/3462/1590/files/23729681106.pdf
    • https://cdn.shopify.com/s/files/1/0441/3197/5320/files/86703328249.pdf
    • https://cdn.shopify.com/s/files/1/0447/9424/9377/files/air_pollution_effects.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0082/files/php_read_file_line_by_line.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/tavedepik.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9750/files/zelorixutoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7775/files/endangered_animals_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/7263/4533/files/free_cost_plus_contract_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2692/files/sinogixinaluxaf.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_off00006ab0.bin
743c349232478b1a29a80baae2352638ef05f549acd4d52d916f607ea9e2e16e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB0 5740 bytes
font_01_sfnt_off00007e14.bin
3a925b73a4b30e4441c9c15b162dc7ca6e72d792749849e6d73c3ec4208ffebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E14 12460 bytes

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