Malicious PDF — malware analysis report

Static analysis result for SHA-256 66015666897f855e…

MALICIOUS

PDF

48.1 KB Created: 2020-08-18 19:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f7a37a831e771bf6fb67106a356e0dc SHA-1: 3e9feff41f7c3d8a3556ce3ec1472631d62be9f5 SHA-256: 66015666897f855ede49f7e1d9b9cecdd1094d1c43194a48d570115ad9ddb0a8
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to an 'Australian tourist visa online application form' and the malicious URL. The PDF_SEO_LINK_FARM heuristic suggests this PDF is part of a link farm, likely to improve search engine ranking for malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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=australian+tourist+visa+online+application+form
    • http://xurarubes.100daysofworkouts.com/uploads/1/3/1/3/131383790/pebowejuruwunetu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/kagawato.pdf
    • https://cdn.shopify.com/s/files/1/0430/5823/3493/files/student_centered_learning_approach.pdf
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/72171230065.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/vejupa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/chobani_coupons.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/exotic_breeds_of_sheep.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0942/files/muxiduderisupoguvaja.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4753/files/tornillo_micromtrico.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/uses_of_computer_in_entertainment.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_off00007ecd.bin
3f379450cde8f39f78d88957bac70ac08558292f733635b0648df146e22cb5f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECD 5208 bytes
font_01_sfnt_off00009076.bin
68a5fb598671b471248436a178664437ccb63929d45631f2112a31f8797eeb7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9076 10316 bytes