Malicious PDF — malware analysis report

Static analysis result for SHA-256 4112a9ad6b4ea1f4…

MALICIOUS

PDF

43.2 KB Created: 2020-08-09 17:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4576dd083da2776f936dec963f2e57f SHA-1: 1841901744ab98b845ba8d26270a268f490ff8a0 SHA-256: 4112a9ad6b4ea1f42abbfabcaf097940bc25f2b31ce7800ac827c79737af0854
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify-hosted PDFs, forming a link farm. One of these links, 'https://ttraff.cc/pify?keyword=que+es+epicrisis+pdf', is identified as a malicious redirector. This suggests the document's primary purpose is to lure users into clicking these links, potentially leading to further malicious content or exploits. The ML classifier strongly supports the malicious nature of this PDF.

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=que+es+epicrisis+pdf
    • http://files.hbcucollegefaircle.org/uploads/1/3/0/7/130776060/diketolavorekivori.pdf
    • http://files.knightsofchivalry.com/uploads/1/3/1/4/131408581/vewezor.pdf
    • http://files.bargeamerican.com/uploads/1/3/2/7/132741382/0d1903c274f0.pdf
    • http://sewored.internationalleatherbear.com/uploads/1/3/1/4/131438477/4263d1ea84aa.pdf
    • http://files.dianas-gardens.com/uploads/1/3/1/4/131483445/deca061a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/23709121476.pdf
    • https://cdn.shopify.com/s/files/1/0448/3494/7233/files/kenmore_refrigerator_bottom_freezer.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/71434170770.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/xamorox.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/kokaloru.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/tevori.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/anesthesiology_self_assessment_and_board_review_basic_exam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56666804065.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/automobile_engineering_rk_rajput.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/78883003559.pdf
    • https://cdn.shopify.com/s/files/1/0434/1861/5975/files/8608335011.pdf
    • https://cdn.shopify.com/s/files/1/0437/1120/1435/files/trends_in_education_and_school_management_in_ghana.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/52935731703.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_off00006b29.bin
7552a4a0925feff7515738007375c50c5489656024dfdbbe25d9558c3cba00c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B29 4968 bytes
font_01_sfnt_off00007c23.bin
6375255de3a7b66736f07b348195d647cad6a7c179e0a4a4acbac16e14f29d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C23 11128 bytes

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