Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e7ba20de832151…

MALICIOUS

PDF

42.5 KB Created: 2020-08-09 20:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c72b38f1e31ed390ceda2c73b677893 SHA-1: 95c98d8c1f0c24cf7caa0108a0324b6a0385d0b4 SHA-256: a5e7ba20de832151f06141023d0fa3265115f0595483ed7fc476f115e9e3bcba
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate downloads, but the primary link redirects to a known malicious infrastructure. The document body text, though garbled, includes the lure 'Cfa level 1 curriculum pdf free download' and the malicious URL, reinforcing the phishing attempt. No scripts were extracted, but the embedded URLs and PDF structure strongly indicate a social engineering attack.

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=cfa+level+1+curriculum+pdf+free+download
    • http://files.northeastmarineelectric.com/uploads/1/3/1/8/131859261/wuwinasesof-saworu-maxuno-juxetaduwat.pdf
    • http://files.christiangreenlmt.com/uploads/1/3/1/1/131164419/wirufotav_tiwebupozafimuv.pdf
    • http://wasuwe.smswanhill100years.com/uploads/1/3/1/4/131406893/37064b640c.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/blowin_in_the_wind_ukulele.pdf
    • https://cdn.shopify.com/s/files/1/0447/8212/5205/files/shinto_rituals.pdf
    • https://cdn.shopify.com/s/files/1/0431/6433/6290/files/motemavamozekogidak.pdf
    • https://cdn.shopify.com/s/files/1/0435/6050/1407/files/muvawozivofufolit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/cctv_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/rezulewusuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/1935/4791/files/advantages_and_disadvantages_of_shielded_metal_arc_welding.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/84309140277.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/vogebirire.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/iluminacion_industrial.pdf
    • https://cdn.shopify.com/s/files/1/0434/7052/0470/files/94398758985.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/18842246410.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/26234479859.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_off000064dc.bin
fccd437ee5b2094032826455027f56ece66433a74351fc72811c53ee9dc9fb27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DC 5232 bytes
font_01_sfnt_off000076af.bin
eb308b71df40c854035859d9b0fff3b6d0e1d1b81d479d022bc3712b4bc79147		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AF 10668 bytes

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