Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d628054df797c8e…

MALICIOUS

PDF

64.0 KB Created: 2020-08-10 09:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c352ae8a6e15dbbd1fe3121d37c4730 SHA-1: 3fa0ef4b6232b8ad9821433526ffcc5981d32f52 SHA-256: 7d628054df797c8ef37ffbc1a43ec0663748d000d0ea8ed318d00a22c1478084
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to known malicious infrastructure, disguised as a medical document. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this redirection. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm or spamming operation. No scripts were extracted, but the embedded URL itself is the primary indicator 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.ru/pify?keyword=critical+care+medicine+pdf
    • http://files.lesboisbands.com/uploads/1/3/1/4/131437210/beputip.pdf
    • http://files.alaskarecyclingcenter.com/uploads/1/3/0/7/130776368/rigodo_lofusef.pdf
    • http://files.smithsustainabledesign.com/uploads/1/3/0/7/130775980/d928afd99632ad6.pdf
    • http://files.fairmountcamp.org/uploads/1/3/1/3/131379971/8995882.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5214/5560/files/jotukamesibimavonika.pdf
    • https://cdn.shopify.com/s/files/1/0452/5791/6578/files/antibiotic_associated_diarrhea.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/mamagaxugujowibefozezib.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/46162112246.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/58292305921.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/nopafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/59508718724.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3973/files/gst_tax_slab_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/webmail_tamhsc_edu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0706/files/40872472239.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/gikixojadu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/88956519708.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_off0000bd05.bin
0e93cbac84871c9e4b9bbc825cd75a856dfdd1335b65f1dbc57bdfc21b02ee09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD05 5028 bytes
font_01_sfnt_off0000ce08.bin
3429253865124f67db14df2df16a8231faa2a13f52151f590fb7b6ea486c5918		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 10756 bytes

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