Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f062ac2ad762e50…

MALICIOUS

PDF

43.1 KB Created: 2020-08-18 17:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f160ec3e6279f423b2c178c7f1d9e4f SHA-1: 38ef6ace0d76cf971a2c1071f1ab212226ad907f SHA-256: 0f062ac2ad762e50b61ef754998c6cdf496dab2b5d4ee5c246433f30b8597b4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though obfuscated, contains text related to 'arduino coding learn pdf' and the malicious URL, suggesting a lure to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=arduino+coding+learn+pdf
    • http://files.ashlandcountytowninsurance.com/uploads/1/3/1/3/131381900/59149385a8f.pdf
    • http://files.oakmont85south.com/uploads/1/3/0/7/130739174/1762308.pdf
    • http://files.greenevilletnhikingcycling.com/uploads/1/3/1/3/131384127/ab6a72.pdf
    • http://files.thejoyfueledteacher.com/uploads/1/3/1/8/131858592/vifufisemizu-fotidezejamel-potijuzebitisu.pdf
    • http://tuwubuda.davispharmacyclub.org/uploads/1/3/0/8/130873995/6bb663e5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1897/6408/files/finding_circumference_diameter_and_radius_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9067/files/linksys_ea6900_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7008/7587/files/lekurifaxexujuso.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/fokivejesuluguwimafujikin.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/sapemufapuvesero.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/gefasapupufup.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/kogejekoxeleporagik.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/zedasebaluf.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/power_bi_report_server_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/34110321930.pdf
    • https://cdn.shopify.com/s/files/1/0432/8482/4222/files/10858590852.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_off00006b71.bin
b8fbec45fb5ab08abcf6d3c5a34669fce72149a1caacb8dbc1db6d282f8dcd98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B71 5136 bytes
font_01_sfnt_off00007cf7.bin
186c3e24e71546c07ad9a7e67eacf53e953888eda64248d51656530e126f2dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF7 10128 bytes

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