Malicious PDF — malware analysis report

Static analysis result for SHA-256 158d35920d1e8209…

MALICIOUS

PDF

39.5 KB Created: 2020-08-19 03:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfa3f5aa750bb4295667735ea3d3154c SHA-1: bf62530716a815c45f63bb0adce73b0173ad74f2 SHA-256: 158d35920d1e82094302eabfbc044b1921f294298e682404166c6315af3888b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as piano sheet music, aiming to lure users to a potentially harmful website. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many pointing to benign Shopify domains, suggests a link farm or SEO manipulation tactic to obscure the primary malicious URL. The document body itself contains obfuscated text and the malicious URL.

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=ophelia+the+lumineers+piano+sheet
    • http://files.theandalusiabookman.com/uploads/1/3/1/4/131437532/jorelipo-fowumopusef-pilewil-tibebev.pdf
    • http://files.mccrearykennel.com/uploads/1/3/1/6/131607163/xizam.pdf
    • http://files.okuharafoods.com/uploads/1/3/1/3/131384432/petukore.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4189/0209/files/apically_repositioned_flap.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/fisewofuramezavatozabakop.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/appetites_2015_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/3394/2423/files/32844241812.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/purebdcraft_1._6._4.pdf
    • https://cdn.shopify.com/s/files/1/0436/9481/7435/files/63347114342.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/85644886679.pdf
    • https://cdn.shopify.com/s/files/1/0428/2987/3318/files/93938369422.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/example_of_application_letter_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2727/files/facebook_post_image_size_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/fegudebiriviw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1609/2828/files/liver_cirrhosis_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0434/9820/9446/files/bosch_logixx_7_washing_machine_manual.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_off00004fba.bin
9d7553d00ec0ba91e8153bec4967ff7bead8c0decf5203234706bd9d00976edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBA 5084 bytes
font_01_sfnt_off000060d8.bin
34820df892e0b2bd3ba3f3b1c19248fbe7abb26f20464ffe44416f36b6a0ac7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D8 14764 bytes

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