Malicious PDF — malware analysis report

Static analysis result for SHA-256 33749cdb984131bf…

MALICIOUS

PDF

37.6 KB Created: 2020-08-22 18:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a164345874462247fe0b43d42b0e0ba SHA-1: 6f2beb93483c0b65324a993258295dea2fab9ecc SHA-256: 33749cdb984131bf0ef6a3d8c21876a9f401c6e58ef2090a7782e44e9e19e66b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various PDF files hosted on Shopify and other domains. One of the primary links, 'https://ttraff.ru/pify?keyword=lagu+racun+asmara+cover+tiya', is flagged as a malicious redirector. This suggests the document's purpose is to act as a link farm, potentially for SEO manipulation or to redirect users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=lagu+racun+asmara+cover+tiya
    • http://saluloru.callourplace.net/uploads/1/3/0/7/130775125/vipava.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/xazisim.pdf
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/grammar_and_punctuation_worksheets_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0435/3199/3242/files/woxarotu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0422/files/95181644755.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/26110756561.pdf
    • https://cdn.shopify.com/s/files/1/0433/5327/6574/files/learning_german_language_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/gatoraziwixenazitajokum.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6165/files/sirusuderurofune.pdf
    • https://cdn.shopify.com/s/files/1/0432/1853/4557/files/11183643803.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5746/files/sawuladudibimuwurom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000406a.bin
670268b5f6e3c7f1a8f49db313de9462b1344fc90e63479f3abfeeb16019e1f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x406A 5192 bytes
font_01_sfnt_off0000520b.bin
89248b58173bc4bc93ac1de8029e02fb82a26c743fdd4e48f90ddf5d36c391f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x520B 10060 bytes
font_02_sfnt_off000074b8.bin
f04fb96856fa86c99babb5bf309615b780632e07d2318923ed038a7bfd4fd4ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 16204 bytes