Malicious PDF — malware analysis report

Static analysis result for SHA-256 9865739f15b9bd83…

MALICIOUS

PDF

43.8 KB Created: 2020-08-24 23:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f74904e989658f166aabd32637dcc596 SHA-1: 7f4e273d0e5b0e73e26ef46876aa706a63d622b0 SHA-256: 9865739f15b9bd83ad662d280347fdd05ed064d60b88272da1ebc4b10811841c
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that is also present in the heuristics and IOCs, suggesting a lure to external content. The primary attack pattern involves leveraging a large number of embedded links to distribute malicious content.

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=cinderella+part+3+songs
    • http://files.rivieranannies.fr/uploads/1/3/0/7/130739480/29d97.pdf
    • http://bepamiten.ghodratibooks.com/uploads/1/3/1/6/131606881/xagunuzob.pdf
    • http://files.rmgraphx.com/uploads/1/3/1/3/131381782/8712b63.pdf
    • http://regeka.miramarbarra.co.za/uploads/1/3/1/1/131164250/sojesap.pdf
    • http://gazivo.marshallwords.com/uploads/1/3/2/6/132682156/3314881.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/lanigewabidi.pdf
    • https://cdn.shopify.com/s/files/1/0436/6050/9337/files/androgenos_femeninos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/zugipebunixozisipuxolilan.pdf
    • https://cdn.shopify.com/s/files/1/0464/6322/1912/files/belarc_advisor_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/toefl_practice_test_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7574/files/janome_new_home_sewing_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/7223/9269/files/appraisee_summary_of_performance.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/desosaloniwirogeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/fawajidiweruj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8956/6621/files/82770878751.pdf
    • https://cdn.shopify.com/s/files/1/0433/9531/7911/files/4430298253.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/cinema_hd_1._4._0_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/5845/2897/files/las_benzodiazepinas.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_off00006d3a.bin
e8d54dd452b295199d378860f07e165a40c21823c65819d5eaaa7e1c2e1c6a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3A 5196 bytes
font_01_sfnt_off00007eea.bin
f612a89e89e5faceae69ffa6b4b152906378edeb58c7c8177db9bf224e99fc96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEA 10388 bytes

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