Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbd3a0f6371ae14…

MALICIOUS

PDF

50.9 KB Created: 2020-08-06 20:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be86849235307e2b21c85ecf77d9663b SHA-1: 412fa7793097c11811f264e9f4b9d508942f412f SHA-256: 2dbd3a0f6371ae14ee2cd7e249d86ac85617bee2314043f9a665bcdd0bcbbf6f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=asma+ocupacional+pdf'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm for SEO manipulation or to obscure malicious destinations. The document body contains garbled text but includes the malicious URL and several Shopify-hosted PDF links, one of which is identified as the entry point for the link farm. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=asma+ocupacional+pdf
    • http://files.robkajiwara.com/uploads/1/3/1/4/131407227/6068525.pdf
    • http://files.bible-truths.org/uploads/1/3/0/7/130738991/lopedafezaled_karerimo_vozubif.pdf
    • http://files.auchterandgood.com/uploads/1/3/0/7/130740256/befuropelufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ziduvawijixivobufanevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/arithmetic_sequence_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/92547941538.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1362/files/9932652801.pdf
    • https://cdn.shopify.com/s/files/1/0431/1174/3639/files/calculus_single_variable_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4965/files/difference_between_validity_and_reliability_in_research.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/mukopunoken.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7711/files/29317902894.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5235/files/27160914901.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8333/files/fubozogopitixewigisemeter.pdf
    • https://cdn.shopify.com/s/files/1/0450/4682/5110/files/net_core_somaxconn.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/77654421744.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1690/files/toleboxib.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ba.bin
260e626279bd3d987a0162e15936fc7cb9bd74191918c83b601d7fcd282ee7b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BA 4876 bytes
font_01_sfnt_off00007725.bin
4f3e4fe749cfc7bba918cdc12dd030adf6629b6e8d8d19dcb3e25a64fea2372f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7725 10460 bytes
font_02_sfnt_off00009b0e.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0E 16204 bytes
font_03_sfnt_off0000b03c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB03C 4324 bytes

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