Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7b3343a55b4e50…

MALICIOUS

PDF

42.4 KB Created: 2020-10-30 15:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d2cd1d0ec58a1ae65894203b0c01c74c SHA-1: bc5860168a87fdcb2944813d12bab8c7d14638c1 SHA-256: 2f7b3343a55b4e50f325bd0ed6d96b5b6b1fab925ff2370f0b88b8f78a8d12c6
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/aws?keyword=petsmart+weekly+ad+coupon'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to S3 buckets. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking PDF link, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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://gettraff.ru/aws?keyword=petsmart+weekly+ad+coupon In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f8e1267665d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/87709079591.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/part_1_iron_curtain_political_cartoon_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/pinenitibe.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/sivowaxikudijidara.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/pdf_to_word_convert_software_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0248/8726/files/3912148991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0953/9748/files/2088219410.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/jibexupepawegezenalurane.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/intro_to_heat_transfer.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/rutoparakeg.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C33 5476 bytes
SHA-256: 8bd504d08bcefe4c0d531ba4cca13bedd16c2f9a427a9519a81d87710854b492
font_01_sfnt_off00006ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECD 2120 bytes
SHA-256: 593d873fa08423e7ead59b01314a4ee04551ac9d9ef78e6b1dc9d39461d3d42e
font_02_sfnt_off00007870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7870 10572 bytes
SHA-256: 83efc011d603e87b68d282fbc0c9c29b09e6cf9e598fd78daef05f71429df477

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