Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79af852a0cc812c…

MALICIOUS

PDF

41.3 KB Created: 2020-08-18 15:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b5d5501cc07d0938f1e9839ea7d9594 SHA-1: 69e00ab41117b16f52db8f4c2807a2fd39e34dae SHA-256: f79af852a0cc812cc48aa0c17d2df31ea9bd065e831c3464e21aacc217e26baf
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link pointing to 'ttraff.ru'. Another critical heuristic flags it as a PDF SEO link farm, with 26 external PDF links generated. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious or unwanted content through a link farm, likely for SEO poisoning or traffic distribution.

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=aap+ka+aana+dil+dhadkana+status
    • http://files.suzannepurvis.com/uploads/1/3/2/7/132711954/4e29e280320.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4432/files/35120225955.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/sapifaguv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/dabokenitez.pdf
    • https://cdn.shopify.com/s/files/1/0428/7142/3135/files/botulismo_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/wajupojijunowab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/descriptive_paragraph_writing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3784/files/grow_taller_after_puberty_dennis_raney_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0444/3917/5335/files/centre_parcs_longleat_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0423/files/basic_pronunciation_rules_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/kindle_epub_to.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0250/files/dmv_accident_report_oregon.pdf
    • https://cdn.shopify.com/s/files/1/0434/1877/9800/files/wikewabozitegut.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_off00004caa.bin
3663012957288c8436bd7857f6de552a772618814f5bb4f04cdd4d67243246f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CAA 5004 bytes
font_01_sfnt_off00005da6.bin
32090a582b9d1e69e6459b507e943975c96b2e55aeea89ce55d3e30106ee5fdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA6 14160 bytes
font_02_sfnt_off00008a87.bin
c71353af4aa5925018d2a599294174b3f9b98baae53444fe2f713b49d14cdb11
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A87 3700 bytes