Malicious PDF — malware analysis report

Static analysis result for SHA-256 73543b2264830c7d…

MALICIOUS

PDF

63.4 KB Created: 2020-08-08 20:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 415a52bc88fcf4ae3a6f6fd8f5500d74 SHA-1: 08a6b15ea81175fa7f23c664b931cf8679d7dece SHA-256: 73543b2264830c7dad3155519e1c45c68a051c7c5fe1b42260630800bb841494
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, includes the target URL and other Shopify links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful sites.

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.ru/pify?keyword=chateau+de+versailles+histoire+pdf
    • http://bikuborom.blessedmemphoto.com/uploads/1/3/1/4/131408899/575330.pdf
    • http://files.robertdidonato.com/uploads/1/3/0/9/130969322/fepululinezana-poram-zolasaduxul.pdf
    • http://files.excelpodiatryclinic.com/uploads/1/3/1/3/131398555/5825504.pdf
    • http://files.bostonareamaskinitiative.com/uploads/1/3/1/4/131453998/9385768.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/77588295401.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/4069213102.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/relujoziguzefave.pdf
    • https://cdn.shopify.com/s/files/1/0435/2504/6431/files/durco_pump_engineering_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/lowes_redding_ca.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/36759097418.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/zitajepe.pdf
    • https://cdn.shopify.com/s/files/1/0439/5941/9038/files/zebulirofupesoxipofes.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/aaba_song_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/3151/8622/files/10202313212.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/78077003558.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/bigovexasinupebegegazi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5941/9038/files/sepubux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a916.bin
d026555294b2dd672690c547a6864c58ac5ecb0faec2a40c23adf5d9defdf443		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA916 4988 bytes
font_01_sfnt_off0000ba2d.bin
d8c13f65cbf397cb9a7deb4ac9184912e5dfa244e1e62b0668d53384a9fb60c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2D 12460 bytes
font_02_sfnt_off0000e0e9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 4324 bytes

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