Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff609b3db4cef80…

MALICIOUS

PDF

43.7 KB Created: 2020-08-03 22:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ded051b6250436d3307fefaf48ee3f04 SHA-1: 8a2a650db888b84413a4137f54ac907a62b3a943 SHA-256: 8ff609b3db4cef80e5accff6fb91d6cae1b3f675324fe5f9a71f9d0318c424ba
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the text 'Tratamiento del cancer de piel pdf' and the malicious URL, suggesting a lure related to medical information. The ML classifier strongly flagged this PDF as malicious, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure.

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=tratamiento+del+cancer+de+piel+pdf
    • http://files.morpheusandiris.com/uploads/1/3/0/7/130738569/76a393.pdf
    • http://wugipafo.protelosgroup.com/uploads/1/3/1/4/131408024/sizubedakowedig.pdf
    • http://lepadixab.basketnineteen.com/uploads/1/3/0/8/130813577/kokule.pdf
    • http://files.selectivemgmt.com/uploads/1/3/1/4/131483275/5652793.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2714/files/nuwekusop.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/47462841901.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8136/files/71609146320.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/11940604051.pdf
    • https://cdn.shopify.com/s/files/1/0435/7973/6223/files/vajunadiwatulatifewape.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/jivevomexelaresig.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/zerejadujodutatoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/satonogetu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/10948963452.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0946/files/zubaxugosapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bugasodaliza.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_off00006cd0.bin
9abe8aed8ad87a6a3711265006decd54e534ce4fc002633a5369a7faf6b9710a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD0 5072 bytes
font_01_sfnt_off00007df9.bin
455d787008bd8b6086c03cbb47ea97910e2650cfd7f1b2c518b40b66023e2b75
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF9 10684 bytes