Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe14d6834af0142…

MALICIOUS

PDF

40.3 KB Created: 2020-08-20 21:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12659da5627e6f9b29a5e8f57aa0b142 SHA-1: 66392911968f2dfc850af4312e8af48cc665ce70 SHA-256: bbe14d6834af01422be986f755bd1820f9bccda5b2cfc6225e6a6e710195fb8e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL found in the heuristic. The presence of numerous links, many pointing to Shopify domains, suggests an attempt to leverage SEO poisoning or a link farm for malicious redirection. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=enumerate+the+unconformities+of+sedimentary+rocks
    • http://files.dougjthomas.net/uploads/1/3/1/8/131856771/pivikokisatoxobulak.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/os_axiomas_de_zurique_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5755/files/bajazu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/76204458190.pdf
    • https://cdn.shopify.com/s/files/1/0436/6663/6953/files/34511976100.pdf
    • https://cdn.shopify.com/s/files/1/0435/2383/4011/files/zalilaxevolebovatek.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/67201326944.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5187/files/wugawatawuxovevolo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7309/2246/files/understanding_the_self_in_anthropology.pdf
    • https://cdn.shopify.com/s/files/1/0431/0725/4439/files/spiderman_minecraft_skin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/install_android_studio_for_ubuntu_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/27221411939.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/compare_and_contrast_functionalism_and_conflict_theory.pdf
    • https://cdn.shopify.com/s/files/1/0447/5607/4645/files/adobe_acrobat_convert_to_editable_word_document.pdf
    • https://cdn.shopify.com/s/files/1/0439/7488/5534/files/wixovupobesazevavadudinof.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_off0000601f.bin
339b8fe3b2bcc27536b8d465cd29617ae5be846cfc2ffaca5c85e32c74af97dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601F 5352 bytes
font_01_sfnt_off00007228.bin
c0c3361b2262359e9f9c9a4570d43641fbad4893952cebc592db8239e5b788d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7228 9964 bytes

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