Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4275bea9f36aed…

MALICIOUS

PDF

43.0 KB Created: 2020-08-08 03:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb920e3d9bf5393772184e18fd36a752 SHA-1: 474a078421a078d004889cda81595a6c968e8e14 SHA-256: cd4275bea9f36aed2f82d13a186294c7202524bd879fefee3e2556056e3125ab
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning to attract unsuspecting users.

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=disadvantages+of+computer+graphics+pdf
    • http://files.suitsswagger.com/uploads/1/3/1/4/131453124/tuwewinil_loxipesalexun_rupabujaveja.pdf
    • http://files.jewsforyeshua.com/uploads/1/3/1/4/131406202/xufavunofugobuduxavu.pdf
    • http://files.heartlandjungians.org/uploads/1/3/0/7/130776841/ziniruper.pdf
    • http://files.apexmiddleschoolpta.com/uploads/1/3/1/3/131378776/1988251.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7247/files/94676201762.pdf
    • https://cdn.shopify.com/s/files/1/0433/2398/1979/files/hollow_cathode_lamp_in_atomic_absorption_spectroscopy.pdf
    • https://cdn.shopify.com/s/files/1/0446/9823/9132/files/porosity_of_ceramics_properties_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9126/files/poraluvivepomi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/seguridad_y_riesgo_electrico.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/45472094443.pdf
    • https://cdn.shopify.com/s/files/1/0429/5901/2006/files/colony_pcr_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/gudup.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/5343839194.pdf
    • https://cdn.shopify.com/s/files/1/0434/7917/1222/files/60496890068.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_off000069d0.bin
359e2f5ad0de117d4e741c9dfbefe641380972747a1d7f4597f5a23150ee1f27
pdf-font-stream PDF embedded font (sfnt) at offset 0x69D0 5596 bytes
font_01_sfnt_off00007cc5.bin
5b704d9d60d96083563247c63b5a9bd50206c16be66db38436d4f97b5c962208
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC5 10032 bytes